From https://factorio.com/blog/post/fff-434
Factorio Space Age is not coming to Nintendo Switch.
Space Age factories are much bigger compared to vanilla, as they span 5 planets. There's simply not enough RAM to fit them and not enough CPU power to run all of it at 60 UPS. Not to mention all the new sprites that were added that will not fit in VRAM.
Factorio 2.0 is coming to Nintendo Switch.
I am currently working on bringing the 2.0 free update to Switch and making sure it's optimized well enough. Since the release process on consoles takes a long time, I prefer to not to give you a conservative release date, and instead just release it as soon as possible, when it's ready. My estimate is that the update will come to Nintendo Switch in 1-2 months.
Meanwhile I recommend you finish your current playthrough if you are almost finishing your save game, as the 2.0 update comes with some updates to rails, fluids, recipes and technologies that might break parts of your base and on Switch you will not be able to downgrade once you update.