The contract including its renewal and termination provisions, an employer letter describing duties and the current period, and the credential evidence the listed profession requires. Where an earlier term has already renewed once, records of that history support a consistent account.
Show the mechanism and the history together
Provide the clause itself rather than a characterization of it, since a reader who sees renews annually unless either party gives sixty days notice takes a different view than one reading ongoing. Add any renewal correspondence, amendments, or statements of work that define the current period. The goal is a file where the contract, the letter, and the requested dates say the same thing.
Hypothetical example: a laboratory information systems analyst is engaged under a master services agreement with rolling statements of work, each carrying its own dates. The master agreement alone answers nothing here; the current statement of work is the document that fixes the period, and both belong in the file. A request of this kind still turns on whether the duties fit a profession that appears on the USMCA list and on whether the person meets that profession’s qualification requirement, so the duty description carries as much weight as the dates.
Ask the employer for the executed statement including its signature page, rather than an internal summary written for the immigration file. Request it from the party that countersigned, not from the recruiter who forwarded the draft.