I'd imagine they would. When you arrive early, they still take you up in the elevator and ask you to sit in the lounge, so fireworks viewing shouldn't be a problem.
They sure will!
Last time we went we had a 9.30 reservation and arrived about 10 minutes prior to Wishes. We were taken up to the restaurant, got a "beeper", watched Wishes and were seated about 5 minutes after the fireworks.