This location says they're open until 11:00pm on Sunday. The location is staffed until 11:00pm on Sunday. If you go through the drive through they will respond.
If you want chicken before 11:00pm you are out of luck. Plan to be greeted by a voice telling you they are out of chicken and because they close in 15 minutes they won't make any more.
Don't come here. Definitely avoid the place after 10pm. If you really want fried chicken go Popeyes where they will serve you chicken during the hours they advertiser they are open.