A periodic report that combines all the sites on an account.

E.g., sites and pages with the most visitors; aggregated views and referrer data.

this can be done already with the roll-up view https://plausible.io/docs/plausible-script#is-there-a-roll-up-view

But can I get weekly and monthly reports of this view?

@Stephen Coles yes, a roll-up dashboard has all the same email reporting options as a regular dashbord