WP Multi User Sitemap Plugin for all Blogs

Good Morning together,

i have my WP Multi User Blog running for several weeks, everything is working fine and with a raising amout of user, the amout of Blogs is also raising. Perfect.

So now i’m starting to think about that it would be a good thing, if the main page would have a sitema?, where ALL Blogs and Postings are included.
Just till this oment, i was thinking that i have on all blogs an Sitemap Plugin running: “Google News Sitemap Feed With Multisite Support – Dynamically generates a Google News Sitemap. No settings.”
But i can’t even find a sitemap.
Somebody knows where they should be saved?

But as said before, I am much more interested if there is a Plugin, that creates automatically for ALL Blogs a Sitemap?

Regards