No. TD status allows a spouse and children under 21 to accompany the TN professional and to study, but it does not permit employment of any kind. If he wants to work he needs his own category, and orchard crew supervision is not a listed USMCA profession on its own.
Each spouse needs a route of their own
TD is derivative and its permissions are narrow: presence and study, not work. A spouse who intends to earn anything in the United States must qualify independently, and the USMCA list is professional, so a supervisor of seasonal orchard labour without a listed degree does not fit it. Hypothetical example: a Lake Country household where the wife holds a nursing offer and the husband assumes he will find similar seasonal supervisory work across the border.
The honest answer is that he can accompany her, manage the household, and study, but cannot take that work on TD. Options depend on his own facts: an employer might sponsor a different category, or he might keep working for the Canadian orchard from Canada and visit, which raises its own questions about where the work is performed. Both must be Canadian or Mexican citizens for TN and TD respectively unless he uses a consular TD visa as a citizen of another country.
Plan his activity as carefully as hers.