How do I know if Lightroom migration is complete

Hi - after resisting for a long time, I finally decided to move from Lightroom 6  to Lightroom cloud.  After a couple attempts, I completed the migration - about 50,000 photos, roughly 500GB.  Though complete, it looks like the files are still syncing, several days later.  Small blue circle-looking thing in the bottom right of each thumbnail.  Status says "Syncing" when I click the cloud icon, but I can't tell if anything is actually happening.

Is there a way to see progress, or know if/when it's complete?

Thanks -