The app is your best bet. They hold some seats and release them as the date gets closer. Just keep checking. If not, then i wouldn't wait at all. Just go there as soon as the park opens and see what they can do for you.
There are no dates because the parks are still on reservations and limited capacity. No mention they are extremely understaffed. If one is expecting a "magical experience" right now, they need to vastly temper those expectations.
It's hard to get a walk in. Sometimes people cancel, but it's unusual. Good luck!!
Get there at 11 to 11:30 and you stand a chance at walk up. Otherwise you could wait hours.
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