How much GB does Fortnite need on the macbook pro?

So… I have now the 2020 model of the macbook pro, just for fun I wanted to have a look if ego shooter player or fortnite work well on it. So I would like to know what the gigabyte number on the full picture means, i.e. Whether it really needs 39 GB.

Thanks for the answers

It is 39.1gb in size as it stands there.

OK thanks