Anecdotally, I’m a night owl by default but if I force myself up for exercise at 7am, I am tired that night and I am better (mentally and physically) that day. My workouts aren’t as good as if they were after work, but it doesn’t matter if I’m going 3/4 times a week.

My mood is better, my routine matches the “world” better, and I would say I’m mentally sharper on those days too. YMMV