Hmm, possibly I'm looking in the wrong place, but as far as I can remember, I've been getting new /e/OS versions about every month, and looking at the release notes [1], they usually seem to include the latest "Android security patches", which I assume is what's relevant - unless there's something else that should also be included?

[1] https://gitlab.e.foundation/e/os/releases/-/releases

Yes, seems like they got it down to ~2 weeks, goo! Good to know, that should be on par with Lineageos.