The vendor picture. Agreements that are expiring, unsigned, or superseded should be resolved before they are put forward as evidence, and the duty description depends on the final arrangement. A filing timetable only makes sense once the delivery model is stable.
Sequence the contracts before the case
Renewing or documenting an arrangement takes as long as the provider takes to sign, which is outside the applicant's control. Set dates for the contract review, the invoice sample, and the duty statement, then discuss travel. Where the US operation is also being established, its own set-up steps run alongside and can slip independently.
Keep commitments to customers and staff behind the evidence rather than ahead of it. Fix the sequence before the dates. The vendor arrangements have to be settled, then the duty description written from them, then the corporate evidence gathered, then legal review, then any filing step.
Each stage depends on a document produced by someone outside the applicant's control, which is where schedules slip. Agree a date by which unsigned or expired agreements are either renewed or removed from the evidence, and hold to it rather than filing around them. Treat approval, visa issuance where applicable, admission, and the lawful start of work as four separate events, and communicate to customers and staff only what has already happened.
A new United States office has its own establishment steps running in parallel and slipping independently.