I am running iOS 11 on my iPad Pro, and thus far, all of my installed apps work properly. I don’t have Procreate installed so I canât personally speak to how it work with iOS 11, but hopefully those that are using it will reply soon...
When i was using ios 11 beta 3 Procreate was quite laggy, stylus delay was a problem so i downgraded to ios 10.3.3.
But its beta 5 now, so you could try. Dont forget to make a backup if you wont like it