Yes, you can file a joint return with your spouse even if they did not live in the US at all during 2021.
If you are filing jointly, you will need to print and mail your return along with the W-7 and any other required documents to
IRS
ITIN Operation
P.O. Box 149342
Austin, TX 78714-9342
Whether you file jointly or separately, when you print and mail your return, as your only options for filing are married filing joint or separate. Even with a separate return, you must include your spouses SSN or ITIN to e-file.
As for appointment time, very few things are quick at this point with the government, so you can try.
You can also file an extension so you can have time to get everything together.
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