This will be a very clean Pluto probe, because the launch was scrubbed again for today (har har). Evidently there was a power outage at Applied Physics Lab in Laurel, Maryland (down the road from where I used to live!), and they are the folks running the show.
The launch has been rescheduled for tomorrow, Thursday, January 19. The launch window is from 18:08 to 21:07 Universal time (10:08 – 1:08 Pacific time).