I think the afternoon hours if we are talking about work and being productive.
If you mean the best regarding mood, I’d say in the early evening.
Mostly, I don’t like the mornings, I don’t like being rushed in the morning, and I don’t like having to wake up early. If I have to wake early once in a while I will never complain, but having to wake daily in the morning is agony for me, I hate it. Since I don’t like it, I am not at my best.
In terms of actions that show me at my best, I would say helping people. I’m very patient, good at training people, good with children. I don’t mind explaining something step by step or twice. I also felt I was a great manager. My staff was always very loyal and hard working, and I miss being a manager.