About 40-59%. Though it's closer to 59%. Most of my Switch games are physical. Well over half of my PS4 purchases are digital.
I purchased all my 3DS and Wii U games physically (obviously not counting digital-only).
The reason I purchase most Switch games physically is because most or all of the game is on the cartridge. That's way different than the PS4 and its Blu-ray discs. And since Switch only supports microSD for expanding storage, the memory is far more expensive per GB. My Switch microSD is 128 GB, largely because I got it in 2017 when that size was more expensive. My PS4 external HDD is 2 TB.
Lifetime Sales Predictions
Switch: 151 million (was 73, then 96, then 113 million, then 125 million, then 144 million)
PS5: 115 million (was 105 million) Xbox Series S/X: 57 million (was 60 million, then 67 million)
PS4: 120 mil (was 100 then 130 million, then 122 million) Xbox One: 51 mil (was 50 then 55 mil)
3DS: 75.5 mil (was 73, then 77 million)
"Let go your earthly tether, enter the void, empty and become wind." - Guru Laghima
