Vox.com has an excellent interview with a food safety expert Ben Chapman. Here is the link to his food safety podcast. The second source is Dr. Donald Schaffner from Rutgers and his article in sciencealert.com.
Both of them agree with the tag line: “Food isn’t the problem, people are.” The biggest risk is people’s contact in the store. To decrease this risk only go to the store if you must, maintain a physical distance from other shoppers, use the hand sanitizer, and wear a mask. Even better is shopping online and getting contact-free delivery or curbside pick-up.
Regarding the groceries, he says there is no evidence of food or food packaging being a source of infection. And, yes federal agencies are looking into this all the time just to be sure. Yes, there may be some virus on the package, but simply washing your hands after unpacking the groceries and before eating is sufficient. He also says that we only need to wash our fruits and veggies in cold water (no soap and absolutely no Lysol).
Dr. Schaffner says there is no evidence that food or food packaging are sources of infection. Putting groceries in your garage for three days also does not make sense. He says to unpack the groceries and wash your hands.
Dr. Chapman also says that takeout food is safe and safer if it is delivered interaction-free.