brown the pork cubes in the Instant Pot using the sauté mode. This can take a bit, so if you feel confident doing both at once, try browning the pork while you prep the veggies.
When the pork is browned, add the chopped veggies and sauté 1-2 minutes. Deglaze the Instant Pot with the white wine, scraping up the browned bits from the bottom.
Add the browned pork cubes and press them down to lightly submerge them in the tomato broth. Set the lid to sealing and select the cooking time. When the cooking time is up, do a quick release.
When the pressure drops, I use a potato masher to break up the pork cubes into tender shreds in the sauce. You can use the Sauté setting at this time to reduce the sauce further.