For the record, with regard to treatment, ivermectin was understood to benefit anyone who had a co-occurring worm infection (targeted by ivermectin) while also having Covid. This just rules out most people in the US as they typically don't have the corresponding worm infections. I myself tried two brands of ivermectin while having Covid, with no luck.
Better to have taken it when (and if) you knew you were exposed. It was always considered to be a prophylactic more so than a treatment. And in that capacity it did seem to work for me. (Having never tested positive for COVID, despite numerous tests, numerous exposures and no shots)