If my spouse (non immigrant visa) is still waiting his SSN (approved), how can I complete my taxes ? I need his SSN in the form.

[maxgad]

This is a Married Filing Separately. He doesn't have an ITIN and he's waiting his SSN card. The SSN card can arrived at any moment, but tax deadline is today.

[DoninGA]

If you are a US citizen or US resident and your spouse does not have a Social Security number or an ITIN and you are not applying for an ITIN with the tax return then you can only file your tax return as Married Filing Separately.  Where asked to enter the spouse's Social Security number enter 999-88-9999.  You can only print and mail your tax return, it cannot be e-filed.  When you print the tax return erase the Social Security number for your spouse and manually enter NRA for non-resident alien.

See this TurboTax support FAQ for the procedure to print and mail a tax return using the online editions - https://ttlc.intuit.com/questions/1944348-how-do-i-print-and-mail-my-return-in-turbotax-online