The ideal scenario is to have the closing date and possession of the home on the same day. The ideal scenario is to receive the keys to a clean, vacant house on closing day.
The standard procedure is that your loan must fund before you receive the keys. Usually the loan funding takes a few hours after all documents have been signed. This normally gets done on the same day as signing. However, if your closing is late in the day, it may not fund until the next day. If possible, allow one day grace period before your moving van arrives at your new home.