Is Cal Poly Pomona rolling admission? Does that mean I have to send my ACT scores as soon as possible or do I wait for BroncoDirect to ask for it?
You apply to Cal Poly Pomona through CSU Mentor. You can have your ACT scores sent to the college. Do not wait to be asked! 
You must submit your application between November 1 and November 30th. They’re not a rolling decision system.
(If you are applying to other CSU campuses, you don’t need to pay to send ACT scores to the additional campuses – use the ACT Score Manager to do so for free.)
So i already submitted my application because they started accepting them since oct.1, does that mean I should send my ACT scores now?
Yes, send your scores now.