The school should’ve told you at the day of interview (of all interviews I’ve had with schools or jobs I’ve always been given a deadline for a response). If you didn’t catch note of it, wait two weeks then call the school.
I had my interview on 10/5/18 (2nd day of interviews) and found out I was accepted on 10/11/18, if you did early decision depending on the school they have to notify you by end of october. My school's deadline for notifying is 10/19/18. Hope it goes well!