What are my chances of receiving Harvard acceptance?

Actually, it's probably less than 10%. Harvard admitted less than 7% of applicants last year, and everyone who applied had great grades and high test scores. If you want a better-than-10% chance, you really need to find some way to stand out. Your activities are pretty good, but nothing really unique. At the least, try to make something in there sound unique. And have a back-up school.