Accidentally shut crock pot off with roast cooking after 2 hours. eat or throw out?

How to cook a roast. 500 degrees for 1/2 hr then turn to 450 and cook roast for 20 minutes/lb with temperature turned off and oven closed. I put a pork roast in the crock pot and 3 hours later determined I forgot to turn it on. Is it safet to cook and eat?