How long should I (20f) wait before hitting on a guy (22m) after his break up?

I have a crush on this guy 22m who is my senior in college. He recently broke up with his gf who he dated for 3 years, they were bestfriends for longer and I guess still are. How long exactly should I wait before making moves or asking him out. For more context- We recently became friends and gotten pretty close We talk almost everyday and hangout once a week.