His head is virtually straight up. He’s certainly looking straight ahead, not down and his shoulders are not drawn forward. He’s not sitting straight up like an arrow, but I would not call that position hunched over.

Ultimately you’ll have to find out what works for you through trial. I crossed the U.S. with a guy who sat very upright due to neck issues. His drop bars were actually rotated up like some kids do. He crashed a couple of times. Once due to being blown over by a strong wind gust crossing a floating bridge in Oregon. Another time the front of his bike lifted up going up a short steep rise despite him having front panniers. Lost his balance and fell.

BTW…Three days and a couple of hundred miles is over 63 miles/day.