NSW 23 (9 of which are third party)
PS4 7 (4 of which are third party)
This week Switch has 9/13 = 69% of third party games on the top 30. This is not terribly different from the past two weeks. Most third party games on the Top 30 are Switch games now. It should be obvious that NSW is the platform of choice for third party developers in Japan. That is the platform where third party games are selling, it has the largest install base, and it is powerful enough to play about 90% of the third party games coming out of Japan.
Most weeks going forward, I'd expect Switch to have the majority of the third party games in the top 30.