The amount of storage space needed will be displayed in the Nintendo eShop when you download the games.
See Also
Free up space - Android HelpTechnical Specs - Nintendo Switch™ - System hardware, console specs - Nintendo - Official SiteNot Enough Space to Download Nintendo Switch eShop ContentGeneral Problems with Downloaded Software (Freezing, Not Responding, etc.)The storage requirements will increase as additional games are added to the software.
If you don't have enough space available, you can delete some content on your system or purchase a microSD card to provide additional storage space. Deleted software can be redownloaded from the Nintendo eShop at no additional cost.
Learn more about what to do when there's not enough space to download Nintendo Switch eShop content.
