Originally it was thought possible the virus spread by touching surfaces, but this hasn't proven to be the way we get it. We get it almost always by breathing in someone else's breath who has it. So while no it can't survive in your yard, it needs a human host to survive and replicate, your husband is subject to catching it from his customers if he isn't religious about wearing a mask and social distancing, even if vaccinated, as so many were allowed by inaction to become infected the virus had a chance to mutate to something strong enough to infect even some of those who are fully vaccinated, although they very seldom need hospitalization or end up in the ICU or die. But this is also true of whenever you go out. The way you'd get it from your husband, or he from you, is by catching it and breathing on one another.
I was told by a doctor that sunlight kills viruses