How can i get Task notification on UI - google-app-engine

I working in Google App engine with JAVA API.
User can upload file in my web app and then I am creating a task to process the file.
Now I need a way by which I can show the overall task progress in UI.
How can I do this.
Do I have to use push notification or SignalR or Cloud Messaging will be help full in this case.
Thanks in advance

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