score:4
You are correct that John Chavis, although he is reported to have been the first college-educated Black/African in America, was never ordained. He was licenced to minister.
It appears that John Gloucester, the founder of the first African American Presbyterian Church in the US, was the first African American Presbyterian ordained. His ordination was on April 13, 1810, in Tennessee, after college level studies around the turn of the century, followed by the founding of the first African American Presbyterian church in 1807, a short assignment in North Carolina, and his return to his Philadelphia young church. As he was licensed only to preach, and not lead, he was allowed to return to Tennessee to complete his required studies for ordination.
My source for research was BlackPast.org. John Gloucester's full story is detailed here.