When is Heathers’ Off Broadway *Opening Night* not 1st Preview?

Hello!

So the first date available for tickets is June 22, and all the promo I’ve seen says “returning June 22” - However, I’m sure that can’t be the actual opening night as most shows have a week of “previews” before official opening night. Does anyone know when the opening night performance is yet? Or am I wrong about this whole thing? Would love help!