Check the employer’s actual commitment and the required immigration process before relying on that date.
Keep predictions separate from permission
A proposed start does not guarantee admission or resolve missing evidence. If the employer’s decision changes, review the current proposal rather than relying on the recruiting schedule.
Begin with the licensing board, since its processing and meeting schedule usually determines the earliest lawful start and is the part nobody can accelerate. Work backward from the proposed first day, listing the employer letter, citizenship proof, credential, assignment terms, and intended procedure as readiness gates. Allow time to obtain an employer letter, resolve credential questions, and decide whether the case will be presented during border inspection or through a USCIS petition. Once the record is stable, a Canadian outside the United States may request TN classification at a port of entry or the US employer may first file Form I-129; after approval of an advance petition, the Canadian must still seek admission. An updated employer letter, a current licence and any change in the role all take time to assemble, and a lapse in the licence or a gap in the employment record is much harder to remedy close to the deadline. If a start date is already fixed, raise that constraint with counsel immediately so the sequence can be planned around it, rather than assuming the letter can be fixed in transit.