Just saw this thread and am posting as a data point.
Expedited Renewal service with 1st time request for card
Overnighted on Friday 12/28/2018
Received by Passport office Saturday 12/29/2019
Received Passport locator# Wednesday 1/2/2019
Received Passport issued email Thursday 1/3/2019
Received Passport 1/4/2019
One week turnaround, we were impressed.