Acorn Squash with Wild Rice Stuffing

uncooked wild rice

olive oil, divided

acorn squashes, halved lengthwise and seeded

kosher salt, divided

sweet Italian turkey sausage links, casings removed

chopped yellow onion

chopped celery

fresh shiitake mushrooms, chopped

minced garlic

fresh thyme leaves

pkg. fresh spinach

chopped fresh flat-leaf parsley

fresh lemon juice

black pepper