Latest Supported C++ Standard

Hi

As far as am aware cpp standard is set in projectname build.cs.
Thats where i set my cpp standard, c++17 compiles c++20 does not

//CppStandard = CppStandardVersion.Latest;
CppStandard = CppStandardVersion.Cpp17;

Can anybody please let me know if ue4 supports c++, also does it support the value of
CppStandardVersion.Latest;

Thanks

Unreal engine is not yet supported yet I believe