https://www.techradar.com/news/nintendo-switch-online-arrives-on-your-console-today-heres-what-you-need-to-do

Nintendo Switch Online is finally, finally coming online - a full 18 months after the hybrid console first launched, and marking the very first time Nintendo has charged for an online membership service to get the most out of your games. We didn’t know how good we had it.

The service is expected to go live at 8pm PST / 11pm EST today in the US, or 4am BST on Wednesday morning in the UK. You can access the service for a full seven days before your free trial ends, when you’ll have to cough up the pennies to keep accessing member privileges like online play and the retro game library (more on this below).