He has until the divorce is final to leave the U.S. Once the divorce is final, he is out of status and begins accruing unlawful presence. At 180 days of unlawful presence, it is a 3 year bar that he cannot come back to the U.S. after he leaves unless he gets a very hard to get waiver. At 1 year of unlawful presence, it is a 10 year bar. If he can find an employer in time to file an H-2B for him, that could help to keep him in the U.S. Or he could change status to F-1 student or J-1 exchange status as long as he can file before his divorce is final.
For an H-2B worker visa, it is expensive and difficult to get because the employer would have to go through an expensive process called a Labor Certification where the position is advertised in the local media, the employer must receive all resumes and eliminate all candidates for valid reasons, not just because they have a job for him. This is to prove that he would not be taking a job away from a U.S. worker. Here is a link:
And here are the links to the F-1 and J-1:
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