I just had to solve a similar problem, the solutions above do the job, however I needed to be able to identify the pod. I'm sharing the command used here:

kubectl get po -o json -A | jq -r '.items[] | {name: .metadata.name, mac: (.metadata.annotations["k8s.v1.cni.cncf.io/network-status"] // "[]" | fromjson | .[0].mac)}'

(note the output includes the pod's name)