As of right now, WDW is closed "indefinitely" -- and apparently their systems have defined "indefinitely" as June 1st. Everything prior to that is unavailable (tickets, resorts, dining, ADRs, etc.). You can keep your plans as-is with a wait-and-see approach because Disney did say they may open prior to June 1st. Or you can reschedule without penalty, possibly taking advantage of the special free dining offer available to those with reservations during the closure.
Enjoy your vacation!