As per the details you have given he is in Mild to moderate category of Covid infection and he seems stable as of now. Inflammatory markers are better to be done(
CRP, S.
Ferritin, D-Dimer, IL6). If fever and cough persists for more than 5 days he can be started on inhaled steroids-MDI with spacer. Anyway check oxygen level 3 to 4 times daily.