A pharmacokinetic calculation I did showed that in order to get antiviral effects from ivermectin in vivo, you would have to take an incredibly large dose of around 30 grams, which might be toxic†. Ivermectin normally comes in 3 mg tablets, and at these normal doses you will not get any appreciable antiviral effect.
The
article linked to in the first post performs a similar calculation and comes to the same conclusion. And so does
this study.
So I don't think ivermectin will have any antiviral effect against coronavirus, at all normal doses.
However, it is possible some immunomodulatory effects of ivermectin could be of benefit for COVID.
† The LD50 of ivermectin for dogs is 80 mg/kg,
1 suggesting that a lethal dose for humans will be around 3 grams.