If you meant Disneyland, it’s unknown what their capacity will be by then, but they are currently at/near 35% (the maximum that they can have with the California tier restrictions and in their current tier level). June 15th, when the tier system for California ends, they will be able to set their own capacity (so back up to 100%), BUT they can only go as fast as they can re-stock and callback/hire/train CMs. It takes about 30 days for that to happen so the thinking is they’ll gradually increase throughout the summer. Yesterday they announced a new round of dining locations that will open June 17th and a few on July 2nd (they already had some things announced for July 2nd, notably the Disneyland Hotel). My guess is that they won’t be at full capacity until it’s only refurbishments that are closed. And right now there’s still a ways to go before we get there.
If you mean Walt Disney World- what @OBNurseNH said. And definitely be wary that Disney World’s system has had glitches and overbooked the parks recently.