Since the oil cools the cover, and the coolant cools the oil, I would hope that whole mess should never exceed 200F?
As a high-side estimate I would guess (hope?) that the side cover never exceeds ~250F / 120C.
There is going to be some radiant heat gain from the exhaust which is going to be hard to estimate.
Maybe someone with an IR temperature gun could shoot a reading on the bottom-side of their stator cover after a good hard ride?