Treat the date as a planning target while eligibility, evidence and the correct process are confirmed. Preparation and the government's decision are two different steps, and an expected date is not itself permission to begin work.
Identify what still needs to be confirmed
Ask who controls each outstanding fact, such as a pending credential evaluation or a client agreement. Recheck current admission procedures before travel, and ask for a fresh review if the employer, duties or assignment changes. A short-term offer does not remove the need to review the applicant's immigration history or any longer-term plans.
Resolve any conflict first, because polished advocacy cannot make contradictory records dependable. For timing, put the employer's start date beside the date every controlling record can be obtained. Recheck procedures after a material change and avoid treating a ticket or client deadline as an approval.
Decide whether the role can wait if a necessary document cannot be verified in time. Hypothetical example: A biochemist is expected for a laboratory launch, but the degree record will arrive later; the employer needs to decide if the start should be delayed rather than promise work before the facts are ready.