It is recommended that a full inventory service is carried out a few days before your tenant moves in, ideally, the day before if possible.
If you have added a check-in to your inventory service, this should be carried out on the day the tenant moves in.
If you do not have a professional inventory and schedule of condition before your tenancy starts, you will struggle to make any damage-related claims on your tenancy deposit.
Learn more about inventories: Why Inventories Are A Landlord 'Must-Have'