Phase 3 clinical trials (the last phase) have begun for antiviral Remdesevir against coronavirus, with results expected on 27th April. This drug has been shown to effectively inhibit the novel coronavirus at low concentrations in cell culture. As it is an existing antiviral (used, but failed against Ebola), if it were to hopefully succeed and show some sort of significant reduction in symptoms in the trial it should be available for mass use very quickly. I believe China has trials ongoing for this too.