Only if TN admission has been obtained before that date. An admission at a port of entry can be immediate, while a Form I-129 petition takes USCIS processing time, so the procedure chosen decides how realistic the date is.
Sequence the admission before the delivery schedule
Hypothetical example: the dealer wants the reliability engineer on site when a new fleet of haul trucks arrives. A Canadian citizen can seek TN admission at a port of entry with the completed documents and, if admitted, begin work at once for the period granted, up to three years at a time. A Form I-129 petition instead depends on USCIS processing, with premium processing available for a fee. Extensions can be sought in increments, and TN itself has no fixed overall maximum, but each admission or extension re-examines the same requirements and the work must remain temporary in nature. If the offer's start date is fixed by the delivery, plan the admission for a date before it and keep a contingency if a port-of-entry request is refused. Do not resign from the Oromocto contractor position until the admission or approval is in hand.
Hypothetical example: a bridge-inspection engineer is expected to join a repair project after a safety shutdown, but the employer has not finished the duty letter. Start with a backward schedule: finish the signed offer, collect the passport and credential records, resolve any translation issue, then choose the admission request or employer petition. The letter and the actual project schedule settle whether the proposed arrival date is credible. A direct request can still be declined if the record is incomplete, so an urgent start date is not a reason to travel with a draft. Keep the current job until permission is obtained, and decide who will cover the project if the planned start must move.