How is jin jun mei (a Chinese tea) made?
According to Wikipedia, Jin Jun Mei tea is just a (unsmoked) Lapsang souchong tea or, in simpler words, a black tea. It is considered a black tea of special or extra high quality, but there are no indications that it is produced differently that "normal" black teas.

You might double-check with your religious authorities as the question of being kosher or not is off-topic here, but as I see it, the same rules apply as for any black tea.