Starlink: Battle for Atlas will be releasing on Nintendo Switch, Xbox One, and PS4 alongside a Day-One patch. This patch includes various bug fixes and improvements for the main game.
Out of technical necessity, these bug fixes and improvements result in a mandatory update for all players, up to 9 GB of additional data on Xbox One, 7.5 GB on PS4, and 6 GB on Nintendo Switch. You will need to have an online connection to download these updates.
For more information about the content of this Day-One patch, don't hesitate to visit this forum post.