Carport roof out of square a little bit

I have a carport roof sheathed in plywood (I did not do that part). I am ready to put the underlayment on (Tyvek). If the roof is slightly out of square, what is the best approach or standard?
I would say it’s a few inches out of square for whatever reason. I am not sure why the guys who installed the plywood did lots of cutting.

Lay the first strip of Tyvek square, and trim where needed at the eave, then just go from there? Or don’t worry about it, because it’s just underlayment.