Yes, as mentioned in several places (including the
announcement post), we are planning to release the plugin for Windows and Linux as well, it's the highest priority of the team working on the plugin.
But once again, if you install the set of plugins mentioned in the linked thread above separately, you'll already get a really solid experience for working with KMP projects. Most of what the new plugin provides is iOS-specific support which is tied to macOS anyway - what you're missing compared to macOS users is mostly small convenience features (like run configs).
You should definitely be able to open projects on Windows and Linux, and edit code in multiplatform projects, and build and run them for Android, desktop, and web. If that doesn't work, please file an issue on YouTrack.