Heat oven to 425 degrees F. Place the squash on a large rimmed baking sheet, toss with 1 tablespoon oil, scatter with half the thyme, and season with 1/2 teaspoon black pepper.
Roast for 15 minutes.
Push the squash to the outsides of the pan and drizzle with 1 tablespoon honey.
Place the salmon in the center, sprinkle with the remaining thyme and season with 1/4 teaspoon each salt and pepper.
Roast until the salmon is opaque throughout and the squash is tender, 8 to 12 minutes more.
Meanwhile, heat the remaining tablespoon oil in a large skillet over medium heat.
Add the kale, season with 1/4 teaspoon salt, and cook, stirring occasionally, for 3 minutes.
Drizzle with the vinegar and remaining tablespoon honey and bring to a simmer.