I'm not familiar with what Degica is actually doing with the Switch RPG Maker, but let's assume that you can't port PC-made MV games to the Switch's port. I have a bit of a background in publishing for Sony, so here's what you can expect.
You'd have to get a dev kit. Switch dev kits are actually only $450. Crazy, really, considering that the old PS3 dev kits were $20,000. I'm unsure if Nintendo uses separate test kits that emulate a retail kit, but if they're like Sony, they do and you have to get that too. This would be cheaper than a dev kit if so.
From there, obviously, you'd need to go through whatever programming hoops there are to get the game running on the Switch. Other engines have optimized the process. RPG maker has not, so, good luck.
But if you've done that, unlike with Steam, you have to go through Nintendo's compliance QA process. You would have to do this for any console port. Since the game is (probably) single player with (probably) no social media functions, it shouldn't be so bad. Nintendo is still the hardest QA to pass, but generally if your game doesn't crash and their team doesn't encounter serious bugs, you should be OK. But you will need to do some QA and add functions you wouldn't normally do on PC. For instance, consoles all have a "suspend" function, where your game must pause and not keep advancing in the background when you return to the console's home menu. Your game can't crash or softlock or whatever when controllers disconnect and reconnect. You have to ensure players adding or mashing on additional controllers can't break the game... And hundreds of other test cases. Any time you want to patch, you have to pass this QA process with the patch applied. This QA process costs... an unknown amount of money. And it'll cost you each time you resubmit if your game failed. But Nintendo is supposed to be friendlier to indies in terms of cost these days, so maybe it won't be so expensive.
After this point, assuming you've reached a point where you either passed the QA or promised to patch the game in X time and got some bugs waived, everything's easy. You just provide promotional materials and when you want to publish the game to Nintendo.