Preheat the air fryer to 400°F for 5 minutes while you prepare the meat.
Pat steak tips very dry with paper towels, then toss with olive oil, kosher salt, and black pepper until evenly coated.
Place steak tips in a single layer in the air fryer basket without overcrowding; cook at 400°F for 6 minutes, shake or flip pieces, then cook 3–4 more minutes until internal temp reaches 125°F for medium-rare or 135°F for medium.
While meat rests 3 minutes, melt 2 tablespoon butter in a small skillet over low heat, add minced garlic and Worcestershire sauce off-high heat and stir 30–45 seconds until fragrant but not browned.
Transfer steak tips to a warm bowl, pour garlic-butter over the pieces, toss to coat, then sprinkle with chopped parsley and lemon zest if using.
Serve immediately; the sauce should be glossy and meat juices slightly pink for medium-rare.