The South Park kids are all grown-up in this tease for the show's Thanksgiving "exclusive event"
Post Covid will apparently follow an adult Kyle and Stan several years in the future

Introducing Endless Mode: A New Games & Anime Site from Paste
Stan and Randy Marsh…in the future! Screenshot: YouTube
South Park has poked around with its characters’ futures before—most notably with the sixth season’s “My Future Self ‘n’ Me,” which briefly shows two different version of the person Eric Cartman grows up to be. (Unsurprisingly, the one powered by spite and terrible choices inevitably wins out.)
Now, though, it looks like the series will be diving head-on into this forward looking concept, with the teaser for upcoming Paramount Plus “exclusive event”—they’re very insistent on the terminology—Post Covid showing an adult Stan and Kyle living in the future, and an elderly Randy being as dumb and short-sighted as ever.