iCloud Photo library progress

Activated iCloud Photo library for my 50 plus thousands photo archive. Got a message at the bottom of "Photo's" window "Uploading 30,322 Items" and it stays there with no change more than 24 hours already. Is that normal?

I have 300 Mb/s internet connection. Saw on net that large databases can take weeks to upload. But does it mean that this process goes in the background with no visible changes?

Strangely enough on other device – on my iPhone in "All Photos" I see selection of 4,300 pictures, including the most recent ones, which are not yet even uploaded to my iMac. My Photo Stream apparently works well.