OpenGL is deprecated on macOS and iOS, because Apple has changed to use Metal: https://github.com/godotengine/godot/issues/19368

That's why Godot is moving to Vulkan, that can also run on Metal: https://godotengine.org/article/retrospective-and-future

For Godot game developers, this will not be visible in any way, it's under the hood change to engine.

For other apps, there is in progress development to run full OpenGL on top of Vulkan with Zink. There is a blogpost about it here: https://www.collabora.com/news-and-blog/blog/2018/10/31/intr...

There is also a talk about it at The X.Org Developer's Conference 2019-10-02 here, for example Blender seems to work already: https://youtu.be/rV0P1ChE_5o?t=3970

All conference recordings are listed at conference website: https://xdc2019.x.org/