Question from a non-Jew

Hello, I am a Christian and I had a question about Judaism if that’s allowed.

I have cousins who are Jewish and I was speaking to one of them about the commandments which I think are called Mitzvot. We were looking through them and we both seemed a bit confused about 591, Appoint a king from Israel (Deut. 17:15). Is there a modern Jewish king?

I mean no disrespect and if questions aren’t allowed I apologise