As of noon Pacific time today, the stimulus package has not been passed and no details of how to apply for any stimulus monies is available.
You can immediately apply for an SBA disaster loan as Covid-19 in California makes us a federal disaster area. https://disasterloan.sba.gov/ela/Account/Login . You can receive low-interest loans up to $2mm. Only use Windows Explorer to get to this website. Do not use Chrome.