How to Alert before SSL Certificate expire?

Do I need to change " output=tmsh list / sys crypto one-line |grep "sys crypto cert" "? If I using firmware 10.2.4.

The code is actually easier in 10.x because the certs are still stored in the directory.

! /bin/bash

 set acceptable threshold in seconds (172800 seconds = 2 days)
threshold=185920000

 get today's date
this_date=`date +%s`

 set path to certificates
cert_path=/config/ssl/ssl.crt/

for f in $cert_path*.crt
do
    this_cert_date_literal=`openssl x509 -in $f -noout -enddate |sed s/notAfter=//`
    this_cert_date=`date -d "$this_cert_date_literal" +%s`

    if [ $this_date -ge $(($this_cert_date - $threshold)) ]
    then
        expires_when=$(((this_cert_date - $this_date) / 60 / 60 / 24))
        echo "$f is about to expire in $expires_when days"

         additional processing for expiring certs goes here 
    fi
done