He is asking will the early access let him play 2 or 3 days POST-release because he wont get his game until then. This is a question no one can answer but SE. I think they should address that, perhaps I can ask in the Beta Forums. You may have to contact SE Support, they might give you an answer. It is a valid reason to let you keep playing but I could see them making everyone enter there game on release day.
An easy fix for that and you would give a 72hour grace period after release before they require you to enter that code form the game. To be honest, they are smart people... now, so I would think that might be the case already. I will ask in the Beta forum and you should try SE Support. I don't think that information has been directly addressed. Someone correct me if I'm wrong.