Nintendo just posted their quarterly financial results and in addition to the Switch being at nearly 20 million worldwide, they updated the million sellers lists.
The fantastic Super Mario Odyssey is at above 11 million units worldwide while Mario Kart 8 Deluxe is over 10. The big new additions are Mario Tennis Aces and Donkey Kong Country Tropical Freeze. The fantastic ARMS has crossed 2 million units as well. ARMS has received a ton of post launch support with content and I hope they add more going forward. I still play it regularly.
All the above games are available on Nintendo Switch.
Source: God is Geek