Not trying to downplay the importance of this, but the LTS versions aren't until the first point release, so 26.04.1 (typically six months or so after the release).
I can't find any link, so I think I'm getting mixed up between what they consider LTS and when the upgrade tool starts prompting to upgrade. If you're on the 24.04 LTS, then you don't get prompted to upgrade until 26.04.1
Here's how they announced 24.04.0. It says LTS and doesn't mention anything about LTS coming in the .1 release: https://canonical.com/blog/canonical-releases-ubuntu-24-04-n...