Since HomeLister will be your listing brokerage to list in the MLS, we do recommend to remove any FSBO listing you have up already.
Zillow will replace your for sale by owner listing with the MLS listing, however it sometimes causes issues and doesn't update correctly if the owner listing isn't removed first. They will not reset days on market to 0 if you don't remove the owner listing first. We recommend removing it 2 days before going live, and at a minimum of 24 hours.