Are they even going to be broadcast? I didn't spot them on the NBC coverage schedule.
You can watch the opening ceremony live at 6 am. I think you should visit nbc’s website for the schedule, they are using like 4 channels. I got a couple of their apps.
On TV: Friday 8pm Eastern
Live stream and other times:
http://www.nbcolympics.com/news/how-watch-opening-ceremony-2018-winter-olympics