I can't get a delivery window at all in Instacart right now. I can't get pickup of delivery from any grocery store in northern New Jersey right now.
I don't know if either of my other suggestions are of any use to you, but I genuinely wish you luck in your search.
This is what I did. A small, upscale grocery near me started offering curbside pickup: you send in an order in the morning, get called to arrange payment in the afternoon, drive there the same day, and they drop off your groceries at your car. Worked perfectly. Yum.
Indeed, prominently advertised on their website: https://www.rosewoodmarket.com/grocery-curbside-pickup/
Unfortunately this is in a different state. But maybe Mountain View/Palo Alto/Sunnyvale/etc. has something similar? Where do all the vegans and serious foodies shop? I'd try there.
Another suggestion, which I have not tested yet personally, would be to look up small grocers in your area. If you're willing to drive to pick up your shopping, a small grocer may be willing to prepick your order and have it ready for you in the parking lot without an intermediary.
A third option would be to check for local milkman deliveries, since many of them deliver more than just milk. A quick search for the Bay Area brings up "Bay Area Milkman" and "Milkman SF". Again, haven't tried them so can't vouch for them, but I'm keeping similar options in my own back pocket if/when we need them.