Hey @stefanvasic,
This has been a recurring issue recently for users across the forum. I would recommend looking for other posts as well just to see if there are any details that might help you.
The best way (although not amazing) to get more information on your build status will be to call Apple Developer Support and see if they can verify that your builds exist in the database and provide a status. If they have not completed processing, I would try and verify that they haven't been rejected and still have a chance to finish processing. I have experienced sometimes where with some errors Apple has not found a way to present this information successfully to developers.
https://developer.apple.com/contact/topic/select
Often times unfortunately, Apple will suggest uploading another build.
Hopefully this helps and best of luck!