How long does it take for "Switch to Public preview" to appear?

Or is this (still) a bug as mentioned by lewisryan343 in December of 2020?

https://techcommunity.microsoft.com/t5/microsoft-teams/how-can-i-get-public-preview-i-do-not-have-it/m-p/1988154 

Yes, I've already set "Show preview features" to "Enabled" in the "Teams update policies".