Trim tough ends of asparagus and save for soup. Place asparagus in a large bowl and toss with about 3 tablespoons extra-virgin olive oil, 2 tablespoons of chopped thyme leaves and salt and pepper. Spread the asparagus out on a cookie sheet and roast 10 to 12 minutes until the asparagus is tender and crispy at the tips.
Heat a large skillet over medium to medium high heat; add 2 tablespoons extra-virgin olive oil, 2 turns of the pan, and 2 tablespoons butter to the pan. Place flour in a shallow dish. Season chicken with salt and pepper then dredge the tenders in flour and add it to the pan. Cook chicken 7 to 8 minutes until browned. Add wine and scrape up browned bits as wine cooks down and bubbles, 30 seconds. Add 1/2 cup stock to skillet. Combine cream and mustard and add to stock. Add grapes to the pan and turn chicken and grapes to coat and combine with the sauce. Simmer 5 minutes over low heat.
Bring remaining 2 cups chicken stock and remaining tablespoon of fresh thyme to a boil in a small pot. Add couscous. Put a tight fitting lid on pot and remove from heat. Let stand 5 minutes, then fluff with a fork.
Serve tenders and grapes on couscous alongside asparagus.