Kevzara (sarilumab) is FDA approved for PMR

Actemra (tocilizumab) is FDA approved for GCA

Both of these biologic medications have been used in the past for the treatment of rheumatoid arthritis (RA).
https://www.rheumatologyadvisor.com/howtotreat/role-of-il6-receptor-antagonists-for-ra-management/
A biologic is considered when a patient is unable to taper down to a lower dose of prednisone. A biologic is also appropriate when a patient has serious side from prednisone.

If you have been on higher doses of prednisone and have side effects from prednisone then either one of these biologic medications would be worth a try.