Unfortunately the feed died for me ~20s before launch (in S. America, and also for several people I was online chatting with [US, Ukraine]). After a bit, the audio briefly came back and I heard the sound of the rocket engine and the announcer say "exploration", which I take to mean the rocket launched. NASA's twitter account also says the rocket lauched[0] and 17 min to orbit[1].
EDIT: Looks like the feed is now revived (12:11 UTC).