I finally bought Captain Toad after skipping it on WiiU. Physical like always, just to be clear.
Also added two other 3rd party in physical format in my collection.

Got a physical copy of Hyrule Warriors Definitive Edition the other day.

If only physical games count, then none. The last physical copy of a game I ever bought was Mario Kart 7 on 3DS. All my Wii U and Switch games are digital. In fact, I am not even sure why I have a few physical 3DS games, but I stopped buying them early on.

On the other hand, I do have an ample amount of digital content on Switch.

Fire Emblem Warriors (D)
2 third party games: both digital

I have new:

Megaman Legacy Collection 1 - 2 (physical box, thank Capcom for this mess, but the second game is digital as you know).
Megaman X Legacy Collection 1 - 2 (Same as above).

I don't know if you count this as 4 separate games, but I think it counts as 4 since they are sold separately on the eShop.

One new game: Overcooked 2! (D)

See I'm already in the Club, thanks!

Add another third party to my list: LA Noire (P)

I've added one digital 3rd party to my library.

I still dislike the Switch and don't want one anytime soon, but bought three more games for it:

Octopath Traveler (P)
Disgaea 5 Complete (P)
Nights of Azure 2: Bride of the New Moon (P)

4 more digital 3rd parties here.