There are exceptions for small or straightforward estates, and a lawyer can advise whether the specific estate qualifies for a faster process, but listing before that authority is confirmed risks a sale falling through at the title stage.
You can prepare the home for market while probate is in progress, including getting comparables and addressing obvious repairs, so you are ready to list the moment authority to sell is confirmed.
Talk to the estate's lawyer about timing before you commit to a listing date. Get your hand-reviewed valuation from Joel Dyck.