When there is a new post to the SO blog, it's featured on every site in the Feature box on the top-right of the sidebar, in the Blog section. Only posts from the main blog show up here automatically (though I believe site moderators can manually pin blog posts there if they want.)
Below that, though, in the Featured On Meta section, a combination of featured posts from meta.SE and meta.site.se appears together.
Is there a way to get new posts from the per-site blogs to show up here as well?
I see some older questions that indicate that new posts used to be indicated in the header bar, e.g.
but those links are no longer present, so that notification doesn't happen anymore.