You wont be able to use cfw on the new models at this time. However, it is rumored that SX OS have found a hardware mod for the new models. Also note that even the old models are now patched (so you cannot run cfw at this time on those either, unless you buy a used one).
However, if you are lucky, you can find an old model switch that comes with firmware 4.1.0, then you can install cfw, even if it is a patched unit (just make sure you read about it before using the switch to connect to wifi, as nintendo locks out users from cfw by hitting these switches with a supernag update notification, so if u stumble across it, do not connect to wifi until you know how to install cfw)
The new models come with firmware 8+ so the hardware mod would be your only bet. There has been some skepticism over the hardware mod.