I think it still is in a "well technically its possible" state. And I fear it'll remain that way for a bit longer.

A while ago I made a small example to test how it would work in an actual project and that uses cmake (https://codeberg.org/JulianGmp/cpp-modules-cmake-example). And while it works™, you can't use any compiler provided modules or header modules. Which means that 1) so you'll need includes for anything from the standard library, no import std 2) you'll also need includes for any third party library you want to use

When I started a new project recently I was considering going with modules, but in the end I chose against it because I dont want to mix modules and includes in one project.