Yeah that's definitely a day-of-week/reporting dump effect making that spike. The 7 day rolling data for deaths shows CA is only 6% below the most recent peak:
https://www.deptofnumbers.com/covid19/california/#deaths
nb: that's my site
https://www.deptofnumbers.com/covid19/california/#deaths
nb: that's my site
We haven't crested the peak in death until a few weeks after we crest new infections, and it doesn't look like we've done that yet.