The project deadline does not authorize U.S. work. Tell the employer which evidence and immigration steps remain unresolved so the operational plan can account for that uncertainty. Avoid treating a requested start date as a government commitment.
Separate project readiness from immigration readiness
The equipment may be ready while the employer letter, credential review or admission process is not. Assign a responsible person to each open item and retain any revised start terms. If the employer proposes remote work from Canada meanwhile, assess that arrangement separately rather than describing it as permission to work physically in the United States. Reassess material changes to the assignment before relying on an earlier TN file.
Work backward from the proposed first day, listing the employer letter, citizenship proof, credential, assignment terms, and intended procedure as readiness gates. Canadian citizens may request TN classification at a port of entry or use an employer-filed Form I-129; neither option lets the project schedule confer work authorization. The work must be prearranged for a U.S. or foreign employer, without self-employment. Do not let equipment delivery or payroll setup blur when productive services begin physically in the United States.
Hypothetical example: A LaSalle electrical engineer is expected to commission a power-distribution test bench on the Monday after installation. When the supplier advances delivery, the employer should issue accurate revised dates and confirm which tasks can genuinely be performed from Canada before admission. The applicant should not troubleshoot onsite early by calling it observation. If duties, recipient, or supervision change, the parties should reassess the TN case and supporting contract before work starts, rather than relying on the urgency of the launch.