Siouxie Wiles discussed this the other day. She said you could bring the groceries in and leave them for 3 days if you didn't have any bleach to spray the outside.
But then one of the Princess ships had virus detected after 17 days so 3 days doesn't seem long enough.
But really if there's virus on the outside packaging, all you need to do is wash your hands after handling, and before eating. That has been shown to be really effective in clinical settings to stop getting the infection, and the viral load is way higher there.