I found something that worked for me when many of the other posted solutions didn't nudge the iCloud pie graph in finder. I just flipped the bird off. I went to Activity Monitor, searched for bird, and then force quitted it. Less than a second later the pie graph in Finder goes from a sliver to a full pie. In my case it seemed stuck on copying a 1.8MB file that probably no longer existed but wierd it didn't time out or give up.
strawbot
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