Combine olive oil, rosemary, thyme, oregano, and cumin in large bowl. Cut chicken into 1½-inch cubes. Add to olive oil mixture. Toss well. Cover. Refrigerate at least 2 hours or overnight. Thread chicken onto 8 metal skewers. Season with salt. Grill over medium-high heat, turning until nicely charred and cooked through, about 14 minutes (internal temperature should reach 165°F.) Serve with hummus and Harissa Sauce. Serves 4.