How to tell which iCloud photos are not yet downloaded?

Sometimes the synchronization process takes way too long. Even though I can see the number of items match with the ones on already-synced devices, I don’t like seeing “… items downloading” for decades. I just want to know which item exactly is being downloaded to my device. Is there any way to know it? If not, is it going to be in the upcoming OS18s? I’d like to know if there’s a place to make feature request.