Gcc 94 / 10.2 has no GCC 20 ?

[Phil Phil via Gcc-help <gcc-help@xxxxxxxxxxx>]

g++ -std=c++20 -dM -E -x c++ /dev/null | grep -F __cplusplus

#define __cpluspluc 201709_L

c++17
for both
aarch64-fsl-linux-g++ (GCC) 10.2.0
and
desktop g++ 9.4.0

Is this normal?

Regards