How do you get a reference to your Scene Delegate (UIWindowSceneDelegate) as you would with your AppDelegate (UIApplicationDelegate)?

Question

Prior to iOS 13, when AppDelegate was king, you could do (well you still can) UIApplication.shared.delegate to get a reference to your AppDelegate. But how do you get a reference to your UIWindowSceneDelegate that manages a single window scene in iOS 13? UIWindowScene.shared.delegate doesn't exist, obviously.