A report is evidence, not work authorization. The actual TN requirements and appropriate admission or other process still need to be satisfied.
Keep the evidence milestone separate from permission
Coordinate the employer’s start date with the real status process. A favourable evaluation cannot guarantee the decision or resolve unrelated employer, ownership or temporary-work conditions.
The safe sequence starts with a written confirmation that the duties fit a listed profession and the credential limb is satisfied; for a diploma-plus-experience case that includes collecting the employer letters, which can take weeks if a former employer is slow. Obtain the final employer letter only after the role, supervisor, pay, location, and expected duration are settled; then check whether the degree, licence, and citizenship documents still match that version. TN admission is granted for a period not exceeding three years and is tied to the employment described, so applying against a schedule that has not settled produces either a refusal or an authorization that no longer matches the work. The immigration step is usually the shorter one; an admission in TN status can be sought once the letter and credentials are ready, and admission is granted for a period set by the officer, with extensions possible while the employment continues.