Not necessarily. Prelaunch cases can proceed where commitments are credible and the enterprise is genuinely ready to operate, so waiting for goods to arrive is a business judgment rather than a fixed rule. What usually sets the timing is when the reservation becomes binding and when supporting records exist. No processing time is guaranteed.
Sequence the contract change and the filing
Set milestones: amended terms signed, payment released from escrow, delivery schedule confirmed, evidence pack reviewed. Canadian citizens generally need an E visa, so allow for the consular step and avoid promising a supplier a start date that depends on it. Remember that a visa's validity period differs from the authorized stay recorded on the I-94, and that temporary intent to depart when status ends remains relevant.
Sequence is where these files fail. The order that works is to amend the terms, obtain the counter-signed amendment, release or restructure the escrow, collect the supplier's confirmation of what is now fixed, and only then assemble the evidence pack. Reversing any two of those steps produces a file describing a position that no longer exists.
Bear in view that a visa's validity period and the authorised period of stay recorded on admission are different things, and that no processing time is guaranteed, so a supplier promised a firm start date is being promised something nobody controls. Hypothetical example: a land surveyor's venture books installation before the amended terms are counter-signed, and the evidence pack has to be rebuilt around a document that arrived late.