How to Alert before SSL Certificate expire?

Thanks evryone for the reply!!I was trying chmod 700 then it was not working but with chmod 755 its working.But it gives bundle or chain certificates expiry date.I m running 11.4.1 version may be tmsh list / sys crypto one-line checking cert for the customers in cert_path=/config/ssl/ssl.crt/ is different for 11.4.x version.