Yosemite: Tioga Pass plowing
 

Has not yet begun. There is a LOT of snow. Take a look at this picture. There has been more snow since it was taken!

https://www.nps.gov/yose/planyourvisit/tioga.htm

Amazing. And that's just the entrance station, not the top of the pass where I'm sure the snow is much deeper.

https://www.nps.gov/yose/planyourvisit/tiogaopen.htm

This is a good page to look at if you want to try guessing the opening date based on April 1 snow pack.

As it shows - years when the the snow pack is 150% or more of 'normal' -- the opening date is usually between June 15 and July 1. This is going to be a late year.