Chances at Harvard, UCLA, Johns Hopkins, and UC Davis?

No one can give you a reasonable estimate of reach, match, safety without your GPA recalculated in a standardized form. Your high school weighted GPA of 4.63 gives no clue as to whether it came from an unweighted GPA of 3.1, 3.6, or 4.0.

For the UCs, calculate your GPA (three variants) with the link in reply #1. The weighted capped version is the one that most UC web sites use for admission stats, and which is the same as what CSUs (other than CPSLO) use.