that's under the state's control. Once the IRS accepts the Federal forms, it can take 6-48 hours during the middle of March...but right now, at the very start ? up to perhaps 4 days.....entirely random..
My federal return was accepted on 2/9, and my California return also hasn't been sent. Since the IRS didn't officially start processing until 2/12, I'd imagine California will hopefully start processing next week, since states begin processing typically after the IRS does. Either way, don't worry, you're not the only one waiting!