According to VVTA, their website wasn't updated yet. By phone, they told me:
Route 20 Departs Wrightwood:
M-F: 7:22am, 8:51am, 10:21am, 11:51am, 1:21pm, 3:21pm, 4:21pm, 6:21pm, 7:41pm.
Sat: 9:18am, 10:48am, 12:48pm, 2:18pm, 3:53pm, 5:18pm, 6:48pm, 8:18pm
Sun: Make reservations (24 hours preferred. One hour ok, if they can)