Our local neighborhood, in South OC, has a. very active group of posters on the Nextdoor app. They’re posting what essential businesses are open, with hours, and where:when they find hard to get items. There’s a list of grocery store hours (with senior hours too) and one of restaurants offers my pick up and delivery. Lots of politics in other posts but, as here, you can be selective in what you read.
I don’t know how widespread Nextdoor is but it’s worth looking into if you’re not familiar with it.