ipad pro 13 restore from iCloud stuck at "about 1 minute remaining"

If the restore process has stalled as described, you will have no alternative other than to perform a forced-restart:

Force restart iPad (models with Face ID or with Touch ID in the top button)

If your iPad doesn’t have the Home button, do the following:

1. Press and quickly release the volume button nearest to the top button.
2. Press and quickly release the volume button farthest from the top button.
3. Press and hold the top button.
4. When the Apple logo appears, release the top button.

Force restart iPad - Apple Support

You are very welcome. I'm delighted that the problem was easily resolved.