When did you start the Kevzara injections?

How long has PMR been treated with prednisone?
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A couple of things to remember ... Kevzara and other biologics take time to work. When I started Actemra injections ... my rheumatologist said I needed to give Actemra at least 3 months to work. I noticed an improvement after 3 months but I wasn't certain that Actemra was working.

The longer you have taken Prednisone ... the longer it will take to taper off Prednisone. This is because of how prednisone suppresses the production of cortisol by the adrenal glands. Adrenal suppression is why it is so difficult to predict how soon you will be able to taper off Prednisone completely. Low doses of Prednisone is where the tapering process becomes very tricky.
https://www.droracle.ai/articles/19822/is-prednisone-5mg-adrenal-suppressive
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In my case, I took prednisone for 12 years so it took me the better part of a year to get off Prednisone after Actemra was initiated. I was reasonably certain that PMR was controlled by Actemra after 3 months.

It took another 9 months for an endocrinologist to say my cortisol level was adequate. I had to stay on 3 mg of Prednisone for an extended period of time while my adrenal function was "sluggish." My endocrinologist said 3 mg of prednisone was a good "maintenance dose" for someone with adrenal insufficiency.

Based on the residual pain and discomfort that I attributed to adrenal insufficiency, I wasn't totally convinced that my cortisol level was adequate for at least 2 years after my first dose of Actemra. I had to resist the urge to take Prednisone again but I wasn't prevented from taking Prednisone again if I "felt the need."