retro pay

I recently left UPS, before doing so I filed a grievance for not getting my full raise. Will I ever see any of this retro pay without a fight? Also, off topic from that.. If you are considered on-call and don’t receive a phone call before start time, is it considered a no-call-no-show...

So I was working at UPS since June 4 2018 ,but I was wrongfully terminated May 21 2019 because of attendance due to medical issue I was having ,and Im currently going into the process with the union to get my job back. The question about the Retro Pay is will I still get it If I can't get my job...