Your wife must have a Social Security Number (SSN) or an Individual Taxpayer Identification Number (ITIN) before you can file a joint return.
Your options are to file as separate for now and amend to a married filing joint return when she gets a SSN or ITIN, or to file an extension to file your return by October 15, 2019, depending on if you think her paperwork will be processed by then, or not.