Thanks for your comment. Actually, I also meant isolation when I mentioned ‘purified’. And yes, SARS-CoV-2 has been isolated many times by culturing the virus (also PCR-confirmed) from a clinical sample in a set of cells in the lab, and then sequence the virus’s genome. Here are a few examples of write-ups that you may be interested in:

Severe Acute Respiratory Syndrome Coronavirus 2 from Patient with Coronavirus Disease, United…

Identification of Coronavirus Isolated from a Patient in Korea with COVID-19