You really need to be much more proactive and seek out where it is available BEFORE you test positive. Not all hospitals will administer it. Our daughter told us about monoclonal treatment and suggested that some Mayo clinics will provide treatment.
One key is to get your dose up to 10 days after you test positive. This means, you should not put off getting tested and you need to line up how you can get it before you need it.
You need to ask what the requirements are to get it. Most have to be a certain age and be overweight with diabetes and other things. A healthy person in middle age probably won’t qualify. My wife is reasonably healthy but could win it for me even if she gets covid so I wouldn’t get it. I have about every comorbidity you can have.