Healthline has a good paper on this subject. It's called "The five stages of PARKINSON'S" written by Kristeen Cherney and Ana Gotter. It's a pretty basic and simple description of the stages. There are other examples by others. You may find you can't definitely describe the stage your in; you may have some of the symptoms of different stages. Hopes that helps.

more at https://parkinsonsdisease.net/basics/stages/

Although Parkinson’s disease (PD) is progressive and worsens over time, it is highly individual and affects people differently. Not all people who have PD will experience all the symptoms, and symptoms may vary in their severity between patients. Different people experience progression at different speeds, as well. However, physicians have established stages that describe how the disease progresses. These five stages of Parkinson’s are known as the Hoehn and Yahr Scale used by physicians throughout the world to classify patients in research studies.

I asked twice. Apparently, they don't like to measure it in terms of stages. And that means .......???

I think if you talk to your doctor, they will be able to give you an answer.

All of this has been useful, but it puts me into the 4th stage, and that's not fun to think about.