The minute you believe you are coming down with a cold or flu, is when you need to start. If you have the supply, you use it as a prophylactic. Hours of delay talking to Judges and arguing with idiot doctors, kills many. Monoclonal antibodies is the best for those who are sick IF you can get it.
Monoclonals are the best for those who are sick and the earlier used the better the outcome. So you suggesting people delay and try ivermectin is quite dangerous and the reason we require medical education and licenses to actually practice medicine and give medical advice.