No. A financial event does not grant the required immigration permission.
Record payment and activity separately
Identify where and when the applicant expects to perform duties. Review actual authorization instead of assuming an employer’s payroll schedule controls admission or work eligibility.
A cleaner structure ties the start date, and any bonus payable on it, to the date work is actually authorized to begin rather than to a calendar date chosen in advance. Often the state regulator, because practice cannot begin without whatever licence or authorization it requires, and that process runs independently. Work back from the season the US employer needs covered, then add time for the duty description, the credential documents and, if an advance petition is chosen, its processing. TN preparation and the government's decision are separate steps, and an expected start date is not itself authorization to begin work. TN admission is granted for a period of up to three years, so a later start costs little compared with a refusal on record. Keep the employer informed that the constraint is document retrieval rather than the immigration step, so start-date discussions stay realistic.