iPad Pro circa January 2020 has also been updated to iPadOS 15 so I can check apps and features and update our Cheatsheet. This is slow going, too many distractions.
On my devices the Settings > App Updates is OFF so I can review app changes/updates/compatibility before taping the Update button. More and more apps on our list are showing up as “optimized for 15” and optimized for the new screen sizes of 13 Pro Max.