iCloud Drive on MacOS has been syncing for 3 days

thanks for the reply...

I eventually reached out to Apple Support Team. The first thing they have advised was to turn off my computer and restart again. I asked her if the unsynced data would be lost, because I can clearly see the difference in files in the iCloud online and my local versions. She told me "Don't worry". And I took her words for it. (Silly me right?) So we proceeded to turn off my Mac and restarted it again. And voila! the files are gone!!!!!!!! She advised me to check the trash bin, I can't see anything that's supposed to be synced (that were there previously in my disk). Then we enabled the Icloud sync again. and guess what! it's syncing those files from the online version. Which some of the files were not updated since 2 months back. I don't know how much data I actually lost, but it's some work that I have done, and I have put a lot of effort in them.

I know I am not supposed to rely on just iCloud for the files integrity/backup. But really it's worked so far and I have become complacent and not backing up. I am moving the intact files out of iCloud now.