H1-Transfer - Do I need to wait for Receipt?

freephoneid

Registered Users (C)
Hi,
I want to transfer my H1-B from Employer X to another employer Y. Can you tell me if I submitted all papers to this employer Y, how soon can I join them?

Employer Y told me that you can join us on the same date when we'll courier all the documents to USCIS.

However, I heard that we need to wait for at least the receipt & then only we can join the employer Y. So which one is true?

Do I need to wait for the receipt or can I join on the same day as they sent it to USCIS?

Thanks!
 
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