Humira is a type of immune system affecting drug and is being used on a large scale.
However it can't stop the disease as its deeply related to the auto-antibody production. However it delays the disease progression. Hence, i presume, you got your main answer.
Being an allopathic doctor, i am unaware of the ayurvedic treatment,hence won't be able to comment on herbal treatment. But there is no harm at all to try for the herbal medicines.
Presently i would like you , not to think of any side effects of this therapy as there would be lots of side effects (affecting less than 1% of the population). Hence don't think about that aspect... Let the treating doctor take a stand on continuation of the treatment..after a few dosages. You keep the apprehension levels low and go ahead with the treatment.
As far as measuring the progress, that will be best measured by your treating doctor again....as he will be measuring the stiffness , etc...and pain...
Continuing physiotherapy is recommended as it will help you have a better effect from the medicine.
Feel free to discuss more.