Is there a way to find these communities across instances other than by waiting until a post appears?
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You can search on your instance in the search area: https://lemmy.ml/search
You can do a general search if you want or if you know the name of the community you want to sub to, you can search for
!community_name@instance.url
Another great way to simply find a community is by using https://browse.feddit.de/ Search for an interest/community there and then do a search with the community address on your instance like I said above.
Use lemmyverse.net. then copy and search the URL in your instance