Place all ingredients except cilantro in your Instant Pot, stir well, and set for 30 minutes at High Pressure.
Allow to release pressure naturally, check pork for doneness, check stew for flavor, add chilis or salt as needed, garnish wth cilantro and serve.
If you like your hominy to have a little bite, I suggest you put in half the can while cooking so it flavors and thickens a bit, and save the other half to add after cooking. I put all mine in.
You can also use hominy grits (with liquid) if you'd prefer.
If you'd prefer to make this with chicken, I suggest you use boneless, skinless chicken thighs and cook for 10 minutes under pressure. At the end of the cooking time, allow the pot to rest undisturbed for 10 minutes, and then release all remaining pressure. Just like that, you will have a fabulous pozole de pollo, or a chicken pozole.