The handover is well prepared. Record the condition cleanly on the effective date.
If the effective date, the vacated and unencumbered condition and a handover protocol are agreed, the essentials are covered. With handover, possession, use and the risk of accidental loss pass to you; ownership only passes once you are registered in the land register. Check that from the effective date benefits and burdens, that is operating costs, charges and any income, are accounted for correctly.
At handover, document meter readings, keys and the documents handed over. Clarify whether part of the purchase price is retained until proper handover or steered through the escrow account.