iCloud Original Photos Download Interrupted by Power Loss

Upgraded to 10.15.2 last night.

1) Install went fine.

2) Initated download of all my originals from my iCloud photo library to my iMac. It was flying. It was 88% done in about 20 hours. (1.4tb of 1.6tb)

3) However, I had a power loss. Unbelievable luck. When I rebooted after power was restored, Photos was right where I expected it to be: about 10% of the items to go ("Downloading 10500 originals"). However, it immediately went to this message "Restoring from iCloud" 

My question is: Is the download of originals in some way corrupted because of the power loss? Should I do what I did the other day all over again (re-install OS, start download from scratch?)

It was going incredibly well before the power loss after two months of trouble shooting my iCloud sync I had finally made some progress. Just don't know how to proceed.

Give it some time? What does "Restoring from iCloud" mean?