Well the 2020 Apple Silicon Developer Transition Kit (DTK) was an A12Z processor in a kludged Mac mini. It ran OS11 Big Sur reasonably well. It was not a speed demon but it was usable. The A12Z is a rebranded A12X, using the same T8027 CPU found in the 2018 iPad Pro, but including an improved 8-core graphics processor (7-core in A12X). I believe based on this, Apple could run MacOS on the current iPad Pro, if they want to.Do not think that [MacOS on an iPad Pro] will run to well.
https://en.m.wikipedia.org/wiki/Developer_Transition_Kit
Developer Transition Kit (2020) - The iPhone Wiki
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