He should sign it as quickly as possible so no injunction can be issued against his signing.
Then they will first have to fight the legality of the legislation. That could take quite a while.
He should sign it as quickly as possible so no injunction can be issued against his signing. He's already signed it, so it's moot. But no court would ever issue such an injunction against a Governor, and no Governor would feel bound to obey it. That would be the most egregious example of violating the separation of powers doctrine that I could imagine.