From some online sources, says the release date has not yet been announced but should follow Paramount's 45-day release between ending in theatres and available for streaming which places it around Nov 14, 2022.
Also didn't see it at all from comingsoon.net that listed Paramount+ weekly releases.
Re: Roku says smile is on paramount but i cant find it
Roku gets their information from the various services. If they don't provide the correct data, then Roku will not give you the correct information. Somebody probably coded the wrong date for that movie.
Personally, I use JustWatch to keep track of things. It says Smile is not available for streaming at all, yet. (available as web site or phone/tablet app)