RCに言及してる
https://kledgeb.blogspot.com/2022/04/ubuntu-2204-55-ubuntu-2204-lts-rcubuntu.html?m=1
https://discourse.ubuntu.com/t/jammy-jellyfish-22-04-release-status-tracking/27763
> We’re slowly preparing the final bits to spin out our first candidate images. This should happen somewhen later today (18th of April).

first candidate imagesは向こうの時刻で18日夜っぽいから明日昼くらいだと思う