H, there’s not really much point asking this question, as the road can be closed for a whole day by just a very minor rockslide, so even if the roads authority (is there even such a thing here?) says its open, the information could very easily be wrong by the time you get there.
Although having said that, its been pretty dry recently, so its maybe OK at the moment.
The best way to approach it, in my view, is to go with an open-ended plan. Its effing beautiful down that road, as well as spectacular. So what if you don’t make it all the way across – you’ll still almost certainly have a trip to remember!