ICloud backup not updating.

Check the next back up size. Go to Settings>Your Name>iCloud>Manage Storage>Backups>Your Device Name>Next Backup Size. Let the size load. It can take a little while. See what that says.

What do,you,see when you tap on Backups in the screenshot above? That’s is one of the places where you can see your backup. You can also go to settings>Your Name>iCloud>iCloud Backup>On. You can see the date and time of your last backup in there.