According to the Yosemite National Park website, the Tioga Pass Road opened this morning (June 24) at 8am. That means that PCT hikers may be able to find a ride to the valley for resupply.
However, I could not find any information on when the store/restaurant in Tuolumne will open. Past experience indicates that it often takes a couple weeks after the road is open for the store to be supplied and open.
Good luck to all the hikers who are braving the Sierras right now.
Turtle Walking