The release schedule of the JJK manga isn't fixed. Sometimes it comes out monthly, but it can also be affected by various factors. Keep an eye on the publisher's announcements.
Sorry, I don't know when 'True Story' is coming out. But you could try looking on movie review sites or following the accounts of the people involved in the project to find out.
The third season of the full-time expert would be released in 2023.
While waiting for the anime, you can also click on the link below to read the classic original work of " Full-time Expert "!