diff --git a/web/packages/new/photos/services/ml/bitmap.ts b/web/packages/new/photos/services/ml/bitmap.ts
index fe3fc7da4e..7b851d2b8c 100644
--- a/web/packages/new/photos/services/ml/bitmap.ts
+++ b/web/packages/new/photos/services/ml/bitmap.ts
@@ -7,7 +7,7 @@ import { renderableImageBlob } from "../../utils/file";
 import { readStream } from "../../utils/native-stream";
 import DownloadManager from "../download";
 import type { UploadItem } from "../upload/types";
-import type { MLWorkerElectron } from "./worker-electron";
+import type { MLWorkerElectron } from "./worker-types";
 
 export interface ImageBitmapAndData {
     bitmap: ImageBitmap;
diff --git a/web/packages/new/photos/services/ml/clip.ts b/web/packages/new/photos/services/ml/clip.ts
index 0726929e2a..16bf637e5a 100644
--- a/web/packages/new/photos/services/ml/clip.ts
+++ b/web/packages/new/photos/services/ml/clip.ts
@@ -4,7 +4,7 @@ import type { ImageBitmapAndData } from "./bitmap";
 import { clipIndexes } from "./db";
 import { pixelRGBBicubic } from "./image";
 import { dotProduct, norm } from "./math";
-import type { MLWorkerElectron } from "./worker-electron";
+import type { MLWorkerElectron } from "./worker-types";
 
 /**
  * The version of the CLIP indexing pipeline implemented by the current client.
diff --git a/web/packages/new/photos/services/ml/face.ts b/web/packages/new/photos/services/ml/face.ts
index 5ecd57d771..4e18127a2c 100644
--- a/web/packages/new/photos/services/ml/face.ts
+++ b/web/packages/new/photos/services/ml/face.ts
@@ -26,7 +26,7 @@ import {
     warpAffineFloat32List,
 } from "./image";
 import { clamp } from "./math";
-import type { MLWorkerElectron } from "./worker-electron";
+import type { MLWorkerElectron } from "./worker-types";
 
 /**
  * The version of the face indexing pipeline implemented by the current client.
diff --git a/web/packages/new/photos/services/ml/index.ts b/web/packages/new/photos/services/ml/index.ts
index 3152980886..39aaeec8d9 100644
--- a/web/packages/new/photos/services/ml/index.ts
+++ b/web/packages/new/photos/services/ml/index.ts
@@ -68,12 +68,17 @@ const createComlinkWorker = async () => {
         computeFaceEmbeddings: electron.computeFaceEmbeddings,
         computeCLIPImageEmbedding: electron.computeCLIPImageEmbedding,
     };
+    const delegate = {
+        workerDidProcessFile,
+    };
 
     const cw = new ComlinkWorker<typeof MLWorker>(
         "ML",
         new Worker(new URL("worker.ts", import.meta.url)),
     );
-    await cw.remote.then((w) => w.init(proxy(mlWorkerElectron)));
+    await cw.remote.then((w) =>
+        w.init(proxy(mlWorkerElectron), proxy(delegate)),
+    );
     return cw;
 };
 
@@ -405,6 +410,8 @@ const setInterimScheduledStatus = () => {
     setMLStatusSnapshot({ phase: "scheduled", nSyncedFiles, nTotalFiles });
 };
 
+const workerDidProcessFile = () => triggerStatusUpdate();
+
 /**
  * Return the IDs of all the faces in the given {@link enteFile} that are not
  * associated with a person cluster.
diff --git a/web/packages/new/photos/services/ml/worker-electron.ts b/web/packages/new/photos/services/ml/worker-types.ts
similarity index 57%
rename from web/packages/new/photos/services/ml/worker-electron.ts
rename to web/packages/new/photos/services/ml/worker-types.ts
index 0e187a178a..2e30703844 100644
--- a/web/packages/new/photos/services/ml/worker-electron.ts
+++ b/web/packages/new/photos/services/ml/worker-types.ts
@@ -1,3 +1,8 @@
+/**
+ * @file Type for the objects shared (as a Comlink proxy) by the main thread and
+ * the ML worker.
+ */
+
 /**
  * A subset of {@link Electron} provided to the {@link MLWorker}.
  *
@@ -12,3 +17,16 @@ export interface MLWorkerElectron {
     computeFaceEmbeddings: (input: Float32Array) => Promise<Float32Array>;
     computeCLIPImageEmbedding: (input: Float32Array) => Promise<Float32Array>;
 }
+
+/**
+ * Callbacks invoked by the worker at various points in the indexing pipeline to
+ * notify the main thread of events it might be interested in.
+ */
+export interface MLWorkerDelegate {
+    /**
+     * Called whenever a file is processed during indexing.
+     *
+     * It is called both when the indexing was successful or failed.
+     */
+    workerDidProcessFile: () => void;
+}
diff --git a/web/packages/new/photos/services/ml/worker.ts b/web/packages/new/photos/services/ml/worker.ts
index e71d56a85d..22013d0811 100644
--- a/web/packages/new/photos/services/ml/worker.ts
+++ b/web/packages/new/photos/services/ml/worker.ts
@@ -22,7 +22,7 @@ import {
 } from "./db";
 import { pullFaceEmbeddings, putCLIPIndex, putFaceIndex } from "./embedding";
 import { indexFaces, type FaceIndex } from "./face";
-import type { MLWorkerElectron } from "./worker-electron";
+import type { MLWorkerDelegate, MLWorkerElectron } from "./worker-types";
 
 const idleDurationStart = 5; /* 5 seconds */
 const idleDurationMax = 16 * 60; /* 16 minutes */
@@ -56,6 +56,7 @@ interface IndexableItem {
  */
 export class MLWorker {
     private electron: MLWorkerElectron | undefined;
+    private delegate: MLWorkerDelegate | undefined;
     private userAgent: string | undefined;
     private state: "idle" | "pull" | "indexing" = "idle";
     private shouldPull = false;
@@ -73,9 +74,13 @@ export class MLWorker {
      * @param electron The {@link MLWorkerElectron} that allows the worker to
      * use the functionality provided by our Node.js layer when running in the
      * context of our desktop app
+     *
+     * @param delegate The {@link MLWorkerDelegate} the worker can use to inform
+     * the main thread of interesting events.
      */
-    async init(electron: MLWorkerElectron) {
+    async init(electron: MLWorkerElectron, delegate?: MLWorkerDelegate) {
         this.electron = electron;
+        this.delegate = delegate;
         // Set the user agent that'll be set in the generated embeddings.
         this.userAgent = `${clientPackageName}/${await electron.appVersion()}`;
         // Initialize the downloadManager running in the web worker with the
@@ -202,6 +207,7 @@ export class MLWorker {
             items,
             ensure(this.electron),
             ensure(this.userAgent),
+            this.delegate,
         );
         if (allSuccess) {
             // Everything is running smoothly. Reset the idle duration.
@@ -276,6 +282,7 @@ const indexNextBatch = async (
     items: IndexableItem[],
     electron: MLWorkerElectron,
     userAgent: string,
+    delegate: MLWorkerDelegate | undefined,
 ) => {
     // Don't try to index if we wouldn't be able to upload them anyway. The
     // liveQ has already been drained, but that's fine, it'll be rare that we
@@ -293,6 +300,7 @@ const indexNextBatch = async (
     for (const { enteFile, uploadItem } of items) {
         try {
             await index(enteFile, uploadItem, electron, userAgent);
+            delegate?.workerDidProcessFile();
             // Possibly unnecessary, but let us drain the microtask queue.
             await wait(0);
         } catch {
diff --git a/web/packages/new/photos/utils/native-stream.ts b/web/packages/new/photos/utils/native-stream.ts
index 70b052b4c1..0475f070db 100644
--- a/web/packages/new/photos/utils/native-stream.ts
+++ b/web/packages/new/photos/utils/native-stream.ts
@@ -7,7 +7,7 @@
  */
 
 import type { Electron, ZipItem } from "@/next/types/ipc";
-import type { MLWorkerElectron } from "../services/ml/worker-electron";
+import type { MLWorkerElectron } from "../services/ml/worker-types";
 
 /**
  * Stream the given file or zip entry from the user's local file system.