Although the 12th will have a lot to view, the best time to see the most of them would be starting close to midnight on Friday the 13th. Those of you staying onsite at the venue are in for quite a show.
Looking northeast around midnight on August 12th-13th. The red dot is the Perseid radiant. Although Perseid meteors can appear in any part of the sky, all of their tails will point back to the radiant. - from science.nasa.gov