My husband has been exposed to covid

My husband was exposed to covid by a worker from another company working in the same job site today and yesterday. He was barely told that the worker tested positive like 30 min ago by the job site supervisor....idk what to do anyone been thru this that can give me some Insight. I’ve read testing isn’t accurate until 5 days after exposure so we don’t know if to get him tested yet or wait :/ 😭 I’m so stressed. So if he got exposed on Wednesday when would he be able to get tested?