The list has been updated through March 31, 2023! Mario Party Superstars has joined the club, making the total list 58 games. 18 are Switch games, which means that it has almost has many 10m sellers as Wii & DS combined. Will match them with TOTK and could exceed them in the next update depending on how much Switch Sports sells (will surpass them easily by the end of the year anyways).
Legends: Arceus is now the highest selling single version Pokemon game. It and LGPE should be able to surpass BW. Maybe BDSP can as well. Odyssey should overtake SWSH. TOTK will probably begin in the Top 30 with the next update.
Even when Switch 10m sellers amount surpasses Wii & DS, the total sales will still be less because of Wii Sports, but it should surpass total sales eventually as well. Kirby & Mario Maker 2 will probably join the club in a year or two.