Probably depends on area. I'm in SoCal and am able to walk into Bloomingdale's Chanel, but the Chanel that's a part of a large indoor shopping mall is by appointment only. I would just call!
Agreed ^ it depends on the area, some you can walk in but you just have to wait in the line. But last time I checked if you go here https://www.chanel.com/us/book-an-appointment/ and you can book an appointment and if you're in an area that's still restricted then the appointment lets you skip waiting in line.