If you are not familiar with the oc command, refer to OpenShift - Getting Started with the oc command.

Typically, Service Accounts are associated with a Security Context Constraint (SCC) and then one or more deployments are configured have the Service Account to control certain things that the deployment is and is not allowed to do. Check out my article Run a deployment with a Service Account and Security Context Constraint.

The oc get serviceaccounts (or just oc get sa) command can be used to list the Service Accounts that have been created in the current project / namespace. By default, each namespace should contain the builder, default, and deployer Service Accounts.

~]$ oc get serviceaccounts
NAME                 SECRETS   AGE
builder              2         224d
default              2         224d
deployer             2         224d
my-servie-account    2         55d

The oc describe serviceaccount command can be used to show more details of a specific Service Account.

~]$ oc describe serviceaccount default
Name:                default
Namespace:           default
Labels:              <none>
Annotations:         <none>
Image pull secrets:  default-dockercfg-t9sz2
Mountable secrets:   default-token-tczbb
                     default-dockercfg-t9sz2
Tokens:              default-token-cnkj6
                     default-token-tczbb
Events:              <none>

Or, the oc get serviceaccounts command with the --output json​ or --output yaml option can be used.

~]$ oc get serviceaccount default --output yaml
apiVersion: v1
imagePullSecrets:
- name: default-dockercfg-t9sz2
kind: ServiceAccount
metadata:
  creationTimestamp: "2021-07-16T17:10:00Z"
  name: default
  namespace: default
  resourceVersion: "10939"
  uid: ea72affa-09a5-41c7-bf8b-6407fb27eebe
secrets:
- name: default-token-tczbb
- name: default-dockercfg-t9sz2