Same-day delivery isn't efficiency; it's made possible by inefficiency, like using more delivery people and vehicles who cover inefficient routes, and using more warehouses closer to delivery areas.

Actually we can't discuss efficiency without making it clear what parameter we are optimizing, at the cost of what (if any) other parameters.

However, usually, if we reduce the time something takes not by cleverly eliminating, rearranging or otherwise streamlining the steps, but rather by some brute force method that requires more resources (more people, more equpiment, more energy), it is hard to frame that as efficiency.