This thread is about the new monorail extension that connects to a new train station on the northest corridor line. This is supposed to open soon, but no date has been announced.
For now, to get from EWR to Newark Penn station, you don't need to take a monorail. Just walk out of the terminal and follow the signs to busses. Take the NJTransit bus #302 Airlink bus to Newark Penn Station. The trip can take awhile.