UPDATE - K7AHR decided to check the ground conditions for these two peaks. Both are apparently accessible with the usual cautions regarding hiking in burn zones.
Hearing that the Big Hollow TH is again open, I began making plans to activate Timbered Peak and Sister Rocks (W7W/LC-064). Unfortunately, a BARC map (dated September 30, 2020) indicates that Timbered Peak was severely damaged in the Big Hollow fire. At this time, there appears to be no way to safely access either summit. More below...