Not automatically. Readiness to apply is not the same as holding cleared cash. The US$15,000 processing fee is payable with the application, while the US$1,000,000 gift is made after successful vetting, when you are instructed. What still governs the outcome is lawful permanent resident eligibility, admissibility and an available visa.
Judging readiness by the date the instruction lands
Work out the settlement date, then ask whether the proceeds will be cleared, unencumbered and transferable if an instruction arrives shortly afterwards. If the sale could slip, identify a second source you genuinely control rather than assuming the trade closes on schedule. The gift is not investment capital, carries no equity and no promised return, so treat it as an outgoing payment in your planning, not a placement.
The applicant must still be admissible to the United States, must fit the underlying classification the program uses, and must have a visa number available. A delayed settlement is not the only place a timeline can slip, since a transfer, once instructed, still has to clear whatever compliance review the receiving institution applies to a payment of that size. Confirm the receiving details in advance and ask what documentation the sending institution will want, so that question is settled before an instruction arrives. Currency conversion and cross-border steps can add their own delay, separate from the underlying sale. Keep a written record of every inquiry made about the transfer, since it can support a request for more time if a delay turns out to be the institution's rather than the applicant's.