You are solving the wrong problem. Curbside pick up is about as safe as delivery for 1/3 the labor cost and the grocer already has enough people if he uses everyone.

A food delivery auction would in some segments drive up the cost drastically when some can least afford it fuelling panic. This panic would fuel buying and hoarding.

Meanwhile the poor flock to the shelves to buy before the rich can pay to have it all delivered for hoarding.

Surge pricing for groceries during a crisis may be one of the worse ideas I've seen on hacker news.