The day after being released on Steam, Metro Exodus peaks at 15.357 players, and hits Steam's top selling game game, despite being avaliable for pre-order on Steam last year, having a EGS exclusivity, and being avaliable on MS Gamepass while MS was offering free memberships. Not bad for a one year old single player game.
Metro Exodus - Steam Charts
An ongoing analysis of Steam's player numbers, seeing what's been played the most.
steamcharts.com