Only that it knows about to start, but I think that once it gets subscriptions to the domain, it starts pulling more automatically. I could be wrong, however - I’m not sure which activities aside from posting are federated.

EDIT: I was wrong - the domain only grabs Threads, so Mastodon posts will likely not show up this way. They may get indexed if they’re sent to a kbin magazine using the @magazinename@kbin.social format