Digital Sales on Switch are actually even higher than the other consoles due to ease of portability. If these are physical only numbers without Nintendo store and amazon reports, I think it is safe to say sales are up there with other mainline games.
Uh... no Switch digital sales are much lower than PS4/XBO. https://www.nintendo.co.jp/ir/pdf/2019/191031_3e.pdf
Nintendo's Revenue breakdown for software last fiscal year:
Retail Games - 75.2%
Digital Versions of Retail Games - 16.8%
Download Only Titles, Add-On Content & Subscriptions - 8%
If you take out the 8% from Download Only, Add-On's and Online Subscriptions it works out that 18.2% of retail/packaged software revenue comes from digital.
While last fiscal year the "PS4 full game software digital download ratio" was 37%.
In terms of revenue Nintendo reported 118.8 Billion yen in digital revenue, PlayStation reported 1102 Billion, almost 10 times as much digital revenue.