If it's branched in October (which looks to be the plan right now) the release will be 24.10, not 24.11. It's written a bit further up on the same page: https://openwrt.org/about/history#release_history
Stable release version numbers are made from the year and the month when a new stable branch was created.
As an example, 23.05 was branched in May 2023 but released in October that year.
That is first, then the phase1 images buildbot can build the basic images and the SDKs. Once those are ready, the vanilla packages can be then built by the phase2 buildbot using those SDKs.
From what I've seen over the past several years, ETAs on the OpenWrt-Devel mailing list are usually overly optimistic by a month or more. If they're estimating a branch from main in October, that makes me think it'll really be more like November or December. But we'll see.