@23152mt Here’s the ones I can answer - You are informed if you are accepted somewhere between later April all the way through July - some find out very very late. Yes, they accept kids from out of state community colleges - USC is private so in state/out of state isn’t relevant, but there are likely better articulation (what transfers) agreements with the CA CC’s cause so many apply. ECs do not matter in transfer process, GPA is the absolute most important thing, along with taking the right classes for your major, and appropriate GEs.
Here is a huge long thread that will probably answer a lot of questions - may want to start in the middle - the last many pages are more about kids getting in or not. I think there is information on what classes are relevant, also check out the USC transfer site. Good luck!