Yep, this is exactly why I saw openings still left at 4:30 PM and there have been others reporting openings left on in to the afternoon.
Now, if you need a full day of time slots to pick from so you can get a certain spot by all means you want to go early.
But for the time being, the rush to sign up, or you are out of luck, is gone. They aren't booked solid by an hour after opening. Or even 2 hours.
Word of note, to those who may be unaware, this is one activity that will cancel for even small amounts of rain, doesn't require lightening, just rain. Due to the elevated stage. So watch the time and the weather and afternoon pop up storms in FL. If your show is cancelled you get a M&G with Vader, at least that is what we got when ours was cancelled. If there are openings for a later show you can reschedule but only if they have some left.
And another tidbit to new to JTA folks, at night they use lit light sabers.