They don't allow you to hop early. At most, I've been able to hop 1-2 minutes before 11, but even that isn't typical.
In the past, they've had the lines to the right be for those with DCA reservations and those to the left were for park hopping. But yesterday that wasn't the case, and everyone just sort of started hopping lines a bit further back and then went to the turnstiles right before 11. They were definitely turning away anyone hopping trying to scan in before 11.