Cotrip.org now says no estimate for reopening.
It's now partially open - from cotrip.org:
UPDATESRed Mountain Pass is open only twice each day during rockfall work. There will be single-lane, alternating traffic through the work zone from 6:30 a.m. to 8:30 a.m. and again and from 4:30 p.m. to 6:30 p.m. The pass will be fully closed all other times until work is complete, possibly by mid-February weather permitting.
The highway has now been reopened with single lane alternating traffic.