I actually have that. It says my iPhone battery is at 92.8%. And my MacBook Pro M1 Pro is at 99% (only 4 charge cycles).
I can’t see how to read the iPad Pro.
And I’ve never seen my iPhone charge held at 80% but I’ve always charged wireless. But at this point I’m not going to worry about it since it’s under AppleCare+. Maybe after my first battery change from Apple I’ll think more about preserving battery lifetime.