https://wccftech.com/mario-kart-tour-multiplayer-mode/

Nintendo has recently announced that Super Mario Kart Tour on iOS will be adding real-time multiplayer support next week. The update is scheduled to go live on March 8 at 8 PM PT, so do keep a lookout for the update. What the update will bring is that you will be able to race against your friends as well as other Mario Kart players from around the world. Scroll down below for more details on the update.

As mentioned earlier, Mario Kart Tour players will be able to race against seven of your friends as well as other players on the platform logged in from all over the world. in total, there will be three new multiplayer options for users: With Friends or Others Nearby, Gold Races, and Standard Race.