Taken from the Switch news channel:
1) Fortnite
2) Animal Crossing: New Horizons
3) Pokemon Sword
4) Pokemon Shield
5) Minecraft
6) The Legend of Zelda: Breath of the Wild
7) Mario Kart 8 Deluxe
8) Super Smash Bros. Ultimate
9) Super Mario Odyssey
10) FIFA 20 Legacy Edition
11) New Super Mario Bros. U Deluxe
12) Super Mario Maker 2
13) Rocket League
14) Luigi's Mansion 3
15) Pokemon: Let's Go Pikachu
16) Pokemon: Let's Go Eevee
17) Splatoon 2
18) Super Mario Party
19) Asphalt 9: Legends
20) Fire Emblem: Three Houses
The rankings are based on time played on all Switch consoles with an EU Nintendo account which data sharing enabled. That means none of my playtime contributed, so this is clearly nonsense
Surprised by any entries or omissions?