Last year my father who came here on visitors visa, had to stay over due to COVID-19 situation. His initial 6 moths was until July 7th. I filed extension for his visitors visa on 6/28 online. Online receipt is available but we haven’t heard anything on extension until today. He went back on November 2020. I was wondering if I wanted him to come back to US now will there be any problem on port of entry?
He shouldn’t return for a year from the date of his departure. Be aware that the general rule of thumb is that the person has to be out of the country for as long as they were in the country.