The Unity-generated C# version is "Latest"

I noticed today that my Rider IDE gets confused about which C# features are allowed in Unity projects. It turns out that Unity still (at least in 2019.3.2f1) generates csproj files with "LangVersion" set to "latest".
I found only a few related discussions, and here
https://forum.unity.com/threads/how-do-you-change-the-target-c-version-for-visual-studio.596440/
it was stated that this issue had been planned to fix long ago.
Is there any progress with this?