When do ticket booths open on a day with MM?

We are arriving really late on a Friday night. I would like to purchase 3 day park hoppers from ARES which come with a MM. However, the only day to use the MM is Sat. I think we’ll need to exchange our vouchers at the ticket booth that morning. Will booths open earlier than MM starts?

I would call and check, but I think the ticket booths open 45 minutes before MM.