No. An announced processing timetable is a statement of intention, not a commitment to any individual applicant, and the sequence begins with vetting rather than with payment. Irreversible personal decisions should follow an actual decision on your case, not a published schedule.
Do the irreversible things last
Sort the decisions into two lists: those that can be undone and those that cannot. Hypothetical example: a furniture-hardware distributor near Saint-Cyrille-de-Wendover gives notice to his largest customer and lists his house after reading an announced timetable; a change in the published terms, or vetting that takes longer than anticipated for reasons peculiar to his file, leaves him with no business, no house and no status. Reversible steps — gathering documents, obtaining police certificates, having records translated, taking advice — can and should proceed early.
Irreversible ones should wait. Ask specifically what stages exist between an application and an outcome, how long each has taken in practice rather than in principle, and what happens to the nonrefundable fee at each stage. Re-verify the current official terms before every payment and before every commitment, because a programme in its early period is precisely the kind whose published details are most likely to change.