New Switch update out now (version 2.1.0)
Switch’s first system update since launch is now available for download. Version 2.1.0 is out now for all users worldwide.
Keep in mind that it does not add any new functionality. “General system stability improvements to enhance the user’s experience,” Nintendo says of the update.
You should be able to continue playing any game you have open while the update downloads. The same goes for accessing the eShop.