It's my understanding that as part of the VIP Select experience, you are offered the choice of boarding first or boarding last. If you choose to board last, how does that work with a carry-on bag?

Do you leave your carry-on with the agent while you're in the lounge and they place it in the overhead so that it's waiting for you on the plane when you board, do you take it with you in the lounge and they reserve overhead space for you to use, or are you simply stuck trying to find the last remaining overhead space as the final person to board?

I'm looking to schedule this during a 1h 3m connection in JFK if it makes a difference.