So, I’m picking up my son at Kiddie Korner preschool (117 Remsen St.) this afternoon and lo and behold, who was hangin’ with the rabbi? Queen Oprah herself. Turns out, she’s in NYC to film her new TV series “Oprah’s Next Chapter,” premiering in January. In addition to sitting down with two Jewish families in Borough Park and Crown Heights for a look into the daily life of Chasidic Jews, the talk show maven came by Brooklyn Heights to have a look at the synagogue’s mikvah, a Jewish bath used mainly for ritual purity.