Your stats are good, especially your Lit/US SAT II scores. Congratulations on the acceptances you have already, especially Williams! However, your extracurriculars are extremely average for these schools-- debate, band, newspaper and honor society are perhaps the most common ECs. I also can’t tell what your major would be. Due to this, I’d say:
Yale: Reject
Brown: Reject (could maybe be waitlist… or maaaaaybe accept, but highly unlikely)
Cornell: Waitlist (maybe accept)
Best of luck! 
Chance me back? http://talk.collegeconfidential.com/what-my-chances/1966406-chance-me-upenn-ed-yale-brown-princeton-etc-will-chance-back-p1.html