What are my chances of getting into Harvard with these credentials?

You look real good but be careful. I had a friend who 4.0 GPA took Calc III his senior year in High School, 34 on the ACT, perfect scores on the Math II and Physics SAT did about 10 extra-curricular activities volunteered 8 hours a week every week he was in high school, played Tuba in a national competing level marching band and still didn't get into MIT. So yeah that's an amazing resume but its not unheard of to still be rejected.