The current official FAQ says the process should take weeks after the processing fee and application are received, assuming timely documents and interview attendance, but that is not a guaranteed deadline. Re-read the official terms immediately before paying.
Sequence the eligibility check before the payment
Because the processing fee is nonrefundable, the order matters: first re-read the official FAQ, review lawful-permanent-residence eligibility, admissibility and visa availability, and only then submit the application and fee. USCIS then instructs the applicant to submit Form I-140G and supporting documents through its portal, conducts vetting, and requests the gift after successful vetting. The current FAQ says the process should take weeks if documents and the visa interview are completed promptly, but that statement is not a guaranteed deadline and visa availability can still cause waiting.
A household should not sell a home or resign from clients on the strength of an expected date. Family members follow the same sequence, and a child approaching twenty-one should be discussed with counsel before payment rather than after. Keep a dated record of each check of the official page, because if terms change between the first reading and payment, the family should decide again on the current terms rather than the remembered ones.