Nintendo released two main versions of the standard Switch. Understanding which one you have is the key to knowing if it's "patched":
If you want to be 100% certain, you can verify your console’s hardware version using these methods: is my switch patched xkj1 top
The XKJ1 prefix indicates that your console is a , which was released with upgraded hardware that permanently fixed the unpatchable "Fusée Gelée" exploit found in early 2017–2018 units. Why XKJ1 Serials are Always Patched Nintendo released two main versions of the standard Switch