Hello and welcome to the RTA forums !

It's usually a lovely time of year to visit and my favourite to be honest, but the weather will do exactly as it pleases and is unpredictable, especially in the mountains. The Tioga Pass doesn't usually close for the season at this point, but the closure only lists the date of when it closed for the season and does not include temporary closures which can occur with an early winter storm, or even freezing temps that leaves ice on the road. There is a good chance that everything will be fine but what you could always do is keep the first night after Vegas open to change, that way you can go around the south of the mountains if you have to and enter Yosemite valley from the south. So you could think about staying around Bishop or Mammoth with the pass open, or around Lake Isabella/Bakersfield if it is closed. Both options would leave you time to enjoy Death valley on the way.