Couldn't find a current coupon on Ozbargain that worked for me. I've just tried the expired coupon from this deal and it worked! You can also view the offer directly here where it states that it expires four days from today (20/10/2020). Hope this works for others as well!
Description on news.com.au: Get groceries delivered straight to your home or pick it up at a store near you for a fraction of the price with this Woolworth coupon code! Shop now and take $20 off any $200 spend!