If you don't wish to attach Form W-7 to your mailed in return, you could file as Married Filing Separately.
You will still need to mail your return with NRA in the spot for your wife's SSN/ITIN.
Or, you could apply for an Extension online so that you have extra time to mail the W-7 to your wife for signing and returning, and then be able to take advantage of the increased Standard Deduction for Married Filing Jointly.
@ksingh
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