CPAP isn't a substitute for intubation and a ventilator. In milder cases of respiratory failure it could assist with gas exchange, but understand it is putting positive pressure gas past a mask which as benflyguy has stated can and will aerosolize the virus increasing the chance of spreading it to others.
Dave is correct in thinking his o2 can ward off hypoxia temporarily before respiratory failure worsens significantly to the point of requiring a ventilator.
Currently all elective surgeries are cancelled in the US. This is to reduce the consumption of supplies and limit the number of patients in hospitals. Also, every anesthesia machine in every operating room has a ventilator built into it. If need be the anesthesia machine ventilators may be used for respiratory failure patients; this would be as an emergent additional capacity overflow from the floor ventilators typically used for longer term vent management should those run out. Elective surgeries being cancelled puts anesthesia workload way way down. This leads to folks who do that work like myself being laid off / furloughed at a time one may think we would be extraordinarily busy.
On another note, there has been observation during SARS and Covid that folks on chronic Chlorquine did not become ill with the virus. Some of my colleagues are advocating for folks on the front line to have access to Chlorquine as a prophylaxis against the virus. Given the high risk environment, the ease of spread, the ability to spread with lack of symptoms, the lack of testing, etc it would be very easy for the healthcare providers to unwittingly act as vectors for the spread. Supply concerns for Chlorquine may be an issue.