Bl4de Unfortunately, we cannot give you a specific date. However, we have addressed an issue reported by users who have been using Unity6 and spine-unity since the beta: EsotericSoftware/spine-runtimes2603
There may still be other problems, but for general use, it is already possible to use spine-unity with Unity6. We do not recommend using it in a production project with a fixed release date, etc., but if you want to experiment with Unity6, you can try using the latest spine-unity runtime.