Storage on device
Once my photos are backed up on the iCloud storage can I delete them from my device?
iPhone 7, iOS 15
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If they are "synced" (using iCloud Photos) you can't do that, 'cause photos would be deleted on iCloud too.
If they are backed up (not using iCloud Photos), you can.
See also this useful procedure to save all your iCloud "synced" stuff to a computer:--> Archive or make copies of the information you store in iCloud - Apple Support
When they are stored on a computer, you can delete what you want (from iPhone or from iCloud).
Regards
Giulio