Governor Newsom recently signed SB 1146, which among other provides new Code Civ. Proc., § 599, which extends "any deadlines that have not already passed as of March 19, 2020" upon continuance or postponement of trial. That includes discovery, expert discovery, and summary judgment motions.
It also provides at Code Civ. Proc., § 2035.310 that deposition officers may appear remotely upon election of either the noticing party or the deponent.