Actually you can find out right now as the release candidate is available and it would be included in this if it was "fixed." Why can't Sonoma be discussed? You can go to the developer forum for Sonoma and ask there and someone will tell you if it's being worked on or not. OpenGL btw, will never make a comeback on MacOS as it shouldn't, it was always broken to begin with with Apple's poor implementation of it, even in OS X. No one really uses OpenGL anymore when developing games and if they do it's like they shot themselves in the foot since there are much better APIs out there. Which is why your Vsync isnt working in your ported apps, if they use OpenGL APIs they must be converted to Metal using a translation layer and this layer uses CPU and not GPU. You are better off asking the developer of your app to create a Metal build of the app so you can take full advantage of its power. The problem is that game developers are either unwilling to learn it and feel that directX ports are just fine (Minecraft for example) or they currently working with the porting toolkit to make it happen. There really is no reason to use OpenGL anymore when Metal is easy to learn and much more powerful and streamlined with huge performance gains. We are seeing more developers coming over to Metal now, especially with the porting toolkit. You can get your hands on a windows version of Minecraft and run it through the porting toolkit and you will have VSync back in the app as it is able to translate the DX12 APIs to Metal using the GPU instead of CPU, along with the 3D acceleration otherwise not existent in ports. If an app is built on windows with DX11, DX12, or OpenGL APIs, it will be converted properly to metal using GPTK and use the GPU instead of the CPU which are what ports do. Vsync is not always a thing you need if the app is made with performance in mind. For example, running FFXIV with Vsync on will cause horrible anomalies and frame skipping, when it's off you will get full frames, no skipping, and faster shader compiling when launching the app. No OS has Vsync in it or requires it, so technically it's not broken. Adaptive sync is in most Mac models which is more than sufficient if your monitor is too slow for the GPU. Vsync is generally only used for older displays that cannot keep up with the GPU. If you are running native Mac apps you will never need Vsync.
Vsync is an openGL thing, and anything that needs Vsync should be rebuilt with Metal APIs, can't expect apple to include extremely old tech in their new systems and models when Metal is more widely accepted. I would be bugging the software developer to stop using OpenGL so their customer base can use their product. That is what it comes down to.
