is Mashiah already incarnated in a human body right now? If so, has he been revealed yet?

Shalom, Thank you for your question. According to Jewish tradition, the Messiah will be a real person. We do not know if he is born yet – and it is possible that there are people who have the potential to be the Messiah alive in every generation. He certainly has not been revealed yet – you would have heard about it! Blessings.