I have an iPhone with iCloud Photos enabled and Optimize iPhone Storage

My iCloud storage filled up at some point, so new photos and videos stopped syncing properly. I also deleted some stuff from iCloud in between, so now I'm not sure which videos have their full resolution originals stored locally and which ones are still only in iCloud or have just optimized versions on my phone.

I want to transfer only the videos whose full quality originals are already stored locally on my iPhone to my Windows PC, so I can free up space.

The problem is that I have way too many videos to check individually, and the Photos app doesn't seem to have a filter for locally downloaded originals.

Is there any way to identify these videos in bulk? Maybe through Windows File Explorer, a third party tool, metadata, or some other method?

Ideally, I want to avoid accidentally downloading all the originals from iCloud just to transfer them.

I'd really appreciate advice from anyone who's dealt with this exact situation. Thanks!