there are two parallel jailbreaks going on.
first is the Team Executor version, which is gonna be a modchip that either you have to bust open the switch to install or will be something that attaches to either the SD or gamecard slot, like DS old mods. I don't really know the date on it, not that interested since it'll cost $$
second is the custom firmware called Atmosphere which will require no chips or anything, just free software jailbreak like the wii u / 3ds ones and replace the Switch firmware with its own version. Its currently expected to be out summer 2018.
lastly of course is the switch emulator on PC I posted above that will let you run switch games on a PC