Rush in Chicago

hi everyone! Sorry if this question is a little weird or stupid. I was wondering if rushing a show is any different in Chicago than in NYC? I want to rush Fub Home next month because it's one of my favorite shows, but I'm a little scared that things are different than in ny. So correct me if I'm wrong, but I show up before the box office opens and wait outside the theater until it does, and then go in and ask if they have rush tix available? And if they don't, I've heard about people going back later and getting tickets then? Any info is appreciated!!

Information about rush is usually posted here on their website. Definitely still call, though. http://www.broadwayinchicago.com/special-offers/