We've been told that the reveal of the Tesla Cybertruck will be live-streamed at 11:00 PM EST (8 PM PST) but we've yet to see an official stream anywhere on the internet. Musk has refrained from using the official Tesla Youtube channel for live streams, so it probably won't happen there, and your best bet is to see the official stream on social media or the Tesla homepage, which was the case last time.
However, there are a few independent youtube channels, at least a couple of which claim to actually be at the event. If things fall through, you might be able to get a good first look in the videos below.