Sequence it before filing, and ideally before signing obligations you cannot adjust. Conflicting contract deadlines and immigration timing need legal resolution together, because a closing date set without that review can force a choice between losing money and submitting an unfinished case.
Build the schedule around retrievals
Some records take weeks: archived bank statements, carrier itineraries, corporate documents held by the seller. Start those requests first, then set dates for the chronology, the legal review, and the evidence package. Remember that a visa's validity period differs from the authorized stay, so plan travel accordingly.
No processing time is guaranteed, and no adviser can promise an approval on a chosen date. There are two clocks and only one of them can be paused. The transaction clock has extension mechanisms built into it: a vendor can agree to move a closing, a lender can re-quote, a lease can start later.
The immigration clock has none of that, and a filing made before the facts are settled cannot be recalled and remade as though the first attempt had never happened. Hypothetical example: an investor acquiring a specialty food-processing plant treats the visa step as the flexible one and the closing as fixed, when the reverse is nearer the truth. Ask the vendor for an extension in writing before assuming one is available, and confirm what it costs.
Remember that a visa's validity period and the authorised period of stay are different measures, so travel planned off the wrong one produces an avoidable question at inspection.