The official page describes a process with fee, vetting, instructions and gift, followed by residence subject to visa availability. No fixed timeline should be relied on; vetting, classification and Visa Bulletin availability each can add time.
Read the process steps, not a promised date
The program's own description is the only reliable statement of its sequence, and it does not guarantee a completion date. An applicant submits the application and processing fee, undergoes vetting, receives further instructions, makes the gift when told, and then proceeds toward permanent residence through the employment-based classification the authorities determine, which depends on a visa number being available under the Visa Bulletin. Hypothetical example: a Boischatel clinic owner is told by an intermediary that residence follows within a few months; she should treat that as a sales claim and ask the intermediary to point to where the official page says so.
Delays can arise from vetting of any family member, from questions about admissibility, from the classification chosen, and from visa availability in that category. Because the fee is nonrefundable, the sensible sequence is to resolve admissibility questions and family composition, obtain tax advice, reread the official page, and only then pay.