The below doiucment states the command to monitor PKI certs
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/sec_conn_pki/configuration/xe-3s/sec-pki-xe-3s-book/sec-pki-alerts.pdf
However i am unable to use the command "show crypto pki timers detail" on my CUBE router which has the IOS version of 16.3.9.
WOuld this command not work on these IOS versions or is there an alternate command to check the same ?