Once again, as I brought up: it's not going to be completely open until March 8th once all of ToonTown comes back online, alongside that: it's actually not the only thing debuting on that same day.
Magic Happen's returns from it's COVID pause, and World of Color - One and Harmonious Journeys debuts, taking people away from Runaway Railway (Which will likely run in a limited capacity mode until March). Super Nintendo World, once it opens on President's Day Weekend, will be the land itself, plus the four mini-games alongside Bowser Jr and Mario Kart; all open alongside it.
It's also once again, the first time Nintendo has opened a land domestically, and word of the land is hitting a lot of non-theme park circuits out of interest and excitement.