Heat olive oil in the Instant Pot with the sauté function on. Add the onions, carrots, and celery, and cook until they're soft, about 8-10 minutes.
Add the ground turkey and chopped olives to the Instant Pot; season with salt and cracked black pepper. Break up the ground turkey with a spatula as it cooks; let it simmer until the meat is cooked and most of the juices have evaporated.
Add the garlic and tomato paste to the Instant Pot, and cook for about a minute, stirring to combine. While stirring, at the red wine. Simmer for another 2-3 minutes, or until most of the wine has evaporated.
Stir in the crushed tomatoes, tomato purée, stock, and fresh herbs. Drop the bay leaves and parmesan rind into the sauce. Bring to a simmer, then turn off the sauté function.
Lock the lid onto Instant pot, set the valve to the sealing position, and set to cook at HIGH pressure for 20 minutes.
When done, and the Instant Pot starts to beep, do a quick release. Once all of the steam is released, carefully unlock and open the lid. Switch the Instant Pot to the sauté function again and bring the sauce to a simmer. Let it go, uncovered, for about 10 minutes, stirring often, until the sauce has thickened to your preferred consistency.
Stir in the milk, more fresh herbs, and nutmeg. Season with salt and pepper, to taste.
Notes
Be sure to check the post for tips, serving ideas, and storage suggestions!