In the event that Hubski truncates the timestamp like it did last time, T-30 is at 16m30s into the video.
This is the public cast. If you want to know more about the how and why they do a great job explaining the mission and the rocket, and that first 16 minutes you may find interesting.
This is the SIXTH successful landing of a first stage rocket. They have tested a returned stage under full thrust for the full duration of a launch with the plan of relaunching that stage this fall. That is the next big milestone to look forward to. If they land a bunch of stages, but cannot reuse them, then all of this is for naught.