Even the faithful who meet the circumstances whereby they cannot attend Mass and are dispensed from attending must still observe the Lord’s Day. The diocese strongly encourages those who are dispensed to spend time in prayer on Sunday, meditating on the Lord’s passion, death and resurrection.
An excellent way to do this is through participating in a broadcast of the Sunday Mass on television or via livestream, and an act of spiritual Communion can be found here: charlestondiocese.org/covid-19-response/spiritual-communion.