Nintendo announced today that 20 SNES games would be making their way to the Nintendo Switch Online service tomorrow, September 5th. The bundle, available only to NSO subscribers, includes classics like Super Mario World, Star Fox, Super Metroid, and Super Mario Kart.
https://www.notebookcheck.net/SNES-OTG-Nintendo-Switch-Online-will-get-20-Super-Nintendo-games-Septermber-5th.434409.0.html