Visited the GP yesterday. I've had a cold or virus (no, not BigNasty19) for almost two weeks. Clinic only allows people in the waiting room if they don't arrive by car. Your car is your own personal waiting room. Phone the clinic upon arrival, the doctor will call you back asap and conduct verbal triage. In my case he said he'd be waiting in the corridor with a precautionary surgical mask for me.
The upshot is that if my cough worsens or I become short of breath, I go immediately to whichever of two Fever Clinics is open/most accessible at the time. Both are in the same suburb, one is 24-hr at the Emergency Dept of a regional Public Hospital, the other is 10am-6pm in a private hospital. If I go there I am to present myself for COVID19 screening on the basis of being immunocompromised.