Hi, thanks for the notice, and sorry for a delay! If you know opening_date (when it will be fully finished), it would be good to add that tag, so it can be checked semi-automatically when finished (e.g. via https://wiki.openstreetmap.org/wiki/Key:opening_date#Practical_useand either online survey or armchair news searches).  But if that "almost" is really just few weeks away, I'm also fine if you prefer to mark them as finished (I've seen too many that get to 90% and then stop due to various issues and turn to ruins instead of being finished, so I personally prefer not to try predicting the future).

As for the imagery, DGU Imagery for Croatia for 2022 (and newer) you can find on https://github.com/osm-hr/mapproxy-hr/ or https://community.openstreetmap.org/t/dgu-ortofoto-2021-2022-2023/116081/5

I've added sources to changeset tag; which is preferred usage nowdays according to https://wiki.openstreetmap.org/wiki/Key:source, hopefully that is fine. 

Cheers and happy mapping!