Nintendo has begun sending out Nintendo Switch game stats to players via the official Nintendo Newsletter. They reveal the total hours played in the past 90 days, the most-played game of this year and the percentile of your top hours against other players. You can check out the image above to see what this particular notification could look like. In my case, The Legend of Zelda: Breath of the Wild is my most-played game this year so far.
Source: Nintendo Newsletter