Latest update of sorts I can find from PG&E...
Four Bay Area counties are included in the second phase of shut-offs, which was scheduled to start at noon and affect about 234,000 more customers. At 12:30 p.m., PG&E tweeted an update saying it would instead take place "later this afternoon and into early evening." The utility did not offer a more specific timeline, though Contra Costa County officials started sharing the news that shut-offs in their area were delayed to 8 p.m. Wednesday.
I read that cost is the main reason that they won't bury the power lines.
"As a 2017 San Francisco Chronicle story notes, it costs about $1.16 million per mile to install underground distribution lines. In cities, that number is much higher; work in San Jose cost $4.6 million per mile. Overhead lines cost about $448,800 per mile in comparison."