"April 1 Snow Survey Results
Park staff have completed the April 1 snow surveys. Water content for the Tuolumne drainage is at 63% of average, and at 64% of average for the Merced drainage."
Historic data: https://www.nps.gov/yose/planyourvisit/seasonal.htm
You can look for years when the snowpack was similar and make a guess as to when each road will open, but also consider....
-> Spring weather. If more snow falls or if the temperatures are cool, the snowpack will not get smaller. Warm weather at high elevation helps to melt snow.
-> Avalanche danger. The safety of the road crew is more important than any road opening date.
-> Road repairs needed. As Glacier Point Road will be closed all of 2022 to rehabilitate and improve the road, my guess is that the NPS won't make extensive repairs to the road this year. Tioga Road currently has 3-6 feet of snow; who knows what the road is like under all that snow.
Here is the plowing website, but updates have not yet begun for the season. Check back after April 15th as the updates sometimes include cool videos or great photos.
This map shows the closed roads in red. Note that the first part of Glacier Point Road (from Chinquapin to Badger Pass) is currently closed to vehicles and open to personal bikes.