https://www.techradar.com/news/nintendo-switch-online-launches-september-18-with-one-week-free-trial

In the same breath that Nintendo announced the date for its rescheduled Nintendo Direct online product announcement, the firm let loose that its Nintendo Switch Online service will go live in North America on September 18 with a one-week free trial for players.

The news came as part of a simple update straight from Nintendo, tucked within the announcement of the new date and time for the next Nintendo Direct video release on YouTube. Otherwise, the announcement has no other information regarding details for the Nintendo Switch's new paid online gameplay service, particularly availability worldwide.