Bulk upload progress indicator for post processing

I am using the File dropper widget to bulk upload documents. Every single document needs to be post processed and that takes a while because several API calls are being done in the post processing.   I was wondering if anyone has found a way of showing progress to the user.    I know I can do this in the background as well, but I would actually like that the user sees which docs have been post processed so that they user can validate the meta data the post processing has added to the document.  
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