My project “Sakai Plus” is adding an LTI Advantage “provider” to Sakai 23.   Sakai already has an LTI 1.1 provider (i.e. you can launch a Sakai tool from another LMS like Canvas, Moodle, Blackboard, etc.).  You can follow progress at:

https://github.com/sakaiproject/sakai/pull/10121

The Sakai Plus effort will build equivalent and expanded support for integrating Sakai into other LMS systems using LTI 1.3 / LTI Advantage.

Unlike most of Sakai (and Tsugi) – the Sakai Plus LTI 1.3 provider will be done completely separately from the LTI 1.1 support.  In lots of other places, a lot of effort has been made to make code support LTI 1.1 and LTI 1.3 simultaneously in the same code base with careful use of if-then-else.  But because the scope of LTI Advantage tool provider is quite a bit broader that the LTI 1.1 provider, it will be kept separate so it can grow without maintaining legacy capabilities.