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@DavidAZ
Just a quick note -- there are a variety of messianic prophecies but Judaism focuses on 4 as a start:
- Build the Third Temple (Ezekiel 37:26-28).
- Gather all Jews back to the Land of Israel (Isaiah 43:5-6).
- Usher in an era of world peace, and end all hatred, oppression, suffering and disease. As it says: "Nation shall not lift up sword against nation, neither shall man learn war anymore." (Isaiah 2:4)
- Spread universal knowledge of the God of Israel, which will unite humanity as one. As it says: "God will be King over all the world – on that day, God will be One and His Name will be One" (Zechariah 14:9).
I copied from https://aish.com/why-jews-dont-believe-in-jesus/ which is a useful site as it sums up a lot of stuff.
Since
1 -- there is no third temple yet
2 -- not all Jews live in Israel
3 -- there is no world peace
4 -- humanity hasn't been united in knowledge of God
and since
Judaism has no concept of a "second coming"
We know that the promised, future king messiah has not arrived.