my spouse I140 is approved and his 8th year extension for H1B alongwith my H4 extension was initiated in April 2016 under regular processing category. We haven't recieved the receipt number till now.
You can file already if eligible under the rules - not every H4 visa holder is - but as a practical matter would be better off having the receipt number.
The information contained in this answer is provided for informational purposes only, and should not be construed as legal advice on any subject matter,not should it be viewed as establishing an attorney client relationship of any kind.
You need to provide all the proof, along with evidence of CURRENT H-4 status at the same time.
Thus, you need the I-797 H-4 approval notice.
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