I'm not taking Kevzara but I have experienced neutropenia on Actemra. The more critical value is the Absolute Neutrophil Count (ANC) and not pecentage neutrophils. ANC is the crucial measure of infection-fighting white blood cells (neutrophils).

My neutropenia was transient and my ANC wasn't so low that I was at risk of an infection. You just need to wait and see what happens. Your doctor did the right thing going to an injection every 3 weeks. Adjusting the time between injections is sometimes all that is needed.
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The following link provides more details:
https://pmc.ncbi.nlm.nih.gov/articles/PMC7376291/
"Decreased absolute neutrophil count (ANC) is observed within hours following administration of interleukin‐6 receptor (IL‐6R) inhibitors sarilumab and tocilizumab. This decrease is not associated with increased risk of infection. Emerging evidence suggests the effects of IL‐6R inhibitors on ANC are due to margination of circulating neutrophils into a rapidly mobilizable noncirculating pool without loss of function, rather than a decreased overall number of neutrophils in the body."