The Wikipedia games lists tend to be quite inaccurate, best to use the actual companies stores if possible. Here from Nintendo
Nintendo DS - 1830
Nintendo Wii - 1755
Nintendo 3DS - 1256
Nintendo Switch - 1117
Nintendo WiiU - 1041
So yeah it's already surpassed WiiU and should surpass 3DS in just a couple of months.
I think a lot of this comes down to the Switch being easily their most friendly and appealing console for Indie Developers.