Does not matter that your LMO is expired; what matters is you have an employer who the Port of Entry officer can call (in case they want to check) that would vouch that you are entering Canada to work for him or her. You should land before the expiration of that visa though, else you start application all over again.
I have a working visa but my LMO is expired...while waiting with my new LMO ,can i enter canada with an expired LMO with a positive visa and work ?