WannaCry ("the attack") didn't target Windows 10 installations (probably since most Win10 users have updates enabled), but Windows 10 is still vulnerable without the patch.
Again, where is the source? I seriously doubt that the worm author would let go such a profitable target if they can infect Windows 10. According to this: https://www.netmarketshare.com/operating-system-market-share... Windows 10 has almost 4 times users than XP (and supposedly the gap is growing larger)
Just have a look at the XML configuration files for the exploits used. They are on GitHub. Windows 10 was not a target.
The difference would be that Win 10's forced updates mean nearly every Win 10 user is patched. It would be a much less successful target (though still a target > 0).