Hard to draw any conclusion from 1 instance, for all we know, Purina ships faster than Optimal 99/100 times. I don't think that's the case, but just saying we really aren't getting useful data by waiting to see how long this one instance of delay lasts. If Bob can pull a few strings, let's get to the good stuff!
I've got two Purina dealers nearby which always have Aquamax MVP available, even during the worst of the pandemic. Optimal, on the other hand, generally takes 3 to 6 days to arrive.
However, the timing advantage flips when it comes to starter feeds or other non-standard formulations. Whether this is purely an artifact of the labor shortage (for some strange reason lots of people prefer to stay at home when that pays more than work) and will pass in time I don't really know.