Lease transfer- when to hand over car

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Hello Experts,

Reaching out to community for thoughts. I apologize in advance if this is a stupid question.

I am in the process of transferring my lease over. The buyer went thru credit check and working on getting check for transfer fees. This is for Lexus IS300

In addition to transfer fees, Lexus financial service asked for my signature, their signature and their insurance information. My question is can I hand over the car to buyer once lexus confirmed they received the documents? I read somewhere the once the final contract with signatures and insurance information is in the mail, it’s safe to hand over keys. I have the copy of signed contract.

I don’t know about Lexus but for BMW there are three specific stages and you aren’t supposed to transfer the car until you explicitly get the letter that says so.