What is the current state of Discourse to threadiverse federation?

I found this article from earlier this year: https://blog.discourse.org/2025/04/discourse-and-the-fediverse/

However, I haven't come across that much content from Discourse platforms over here on Lemmy/Piefed. Is there more work to do with the plugins, or should we work with organizations running Discourse to help them connect with us?

For example, the threadiverse communities for OpenStreetMaps is relatively small, and being able to see / contribute to community.openstreetmap.org would be amazing.

The Discourse ActivityPub plugin is developed by a sole developer but I believe it is ready for use. I also believe he is still working on the plugin so that's positive news.

Federation with Discourse forums is tricky, it's been difficult getting NodeBB to work reliably with Discourse.

Are you able to load Discourse categories in Lemmy?