Is the https://docs.ton.org/learn/tvm-instructions/tvm-upgrade-2023-07 upgrade really available on testnet?

I'm trying to use ECRECOVER but it returns exit status 6 (6 - Invalid opcode. Instruction is unknown in the current TVM version).

and should I define it as:

(int, int, int, int) ecrecover(int hash, int v, int r, int s) asm "ECRECOVER";

?