The game comes directly from Nintendo eShop, you will be able to go online, get updates etc.
After setup process the game will be available to launch on your own account, just as any other game or app you purchased directly in Nintendo eShop.
The MARVEL ULTIMATE ALLIANCE series returns for the first time in 10 years—with a new action RPG—exclusively on the Nintendo Switch™ system! Assemble your ultimate team of Marvel Super Heroes from a huge cast including the Avengers, the Guardians of the Galaxy, the X-Men, and more! Team up with friends to prevent galactic devastation at the hands of the mad cosmic tyrant Thanos and his ruthless warmasters, The Black Order.