There is no fixed waiting period. The practical trigger is when realized funds are committed and at risk, the enterprise is ready to operate or credibly close to it, and the funding trail is documented. Processing times are not guaranteed, so avoid resignations, leases or travel that assume a decision by a chosen date.
Set milestones instead of a target date
Useful milestones include the date each installment clears, the date the enterprise account is funded, the signing of key contracts, and the completion of the source-of-funds file. A Canadian citizen generally needs an E visa to enter in that classification, so build in interview scheduling and any administrative processing. Keep the intention to depart when status ends consistent with housing, schooling and business plans.
Hypothetical example: an aquifer testing services company is to be built from staged proceeds, and the founder wants to file the week the lease is signed. Test that instinct against the milestone list, because a lease signed with money not yet transferred, or an enterprise account funded but not yet spent, can leave the strongest part of the story unfinished. The steadier approach is to record each milestone as it completes and ask counsel at each one whether the picture is now assessable.
A change after filing, such as a delayed installment, a renegotiated purchase or an abandoned location, may have to be explained, so avoid presenting a plan already known to be changing. Keep employment, schooling and housing decisions behind the decision rather than ahead of it.