Late in the day you can expect a "routine" delay going into EWR from CLE due to backed up traffic.

I do most of my flying CLE-EWR- somewhere better and it is a rare occurrance that I am on time into EWR.

On the tarmac in CLE before you take off or on the Tarmac in EWR waiting for a gate to open up ................either way I got $20 says you're cutting it too close................and that's not even addressing weather.