sadly i haven't heard or read any news on this topic. whats clear is that for 3DS Max there will be a plugin but the question is when it will be released.
the open position on 3DS Max: https://www.sidefx.com/careers/software-developer-games-3ds-max-plugin/
there was a simple plugin some time ago from ttvd but it has been taken down from github.https://github.com/ttvd/HoudiniEngineForModo
i don't think that SESI will make a plugin for Modo because to spend the resources for game engine market makes much more sense for them. i hope somebody from the community will do something.