Let's assume you were still legally married on 12/31/22. In that case, you can file jointly if you believe it is in your best interest. You also have the option to refuse, and use one of the separate filing statuses that may be available, either married filing separately, or head of household, as described by others. You can't file as single.
With joint filing, you will generally pay the lowest tax and get the largest refund, because some deductions and credits are limited or disallowed when filing separately. However, you would want to agree in advance about how to divide any refund payment. Also, when you agree to file a joint return, you become jointly and severally liable for all the claims on the joint return, and the IRS can come after either spouse for any wrongdoing, even if you didn't know about it. So the decision to file jointly when a divorce is pending but not completed has more issues to think about than just the size of the refund.
If you agree to file jointly, I would be careful about sending personal information by email. Can you meet your ex in person? Or have them ask questions over the phone? There is no way to generate a PDF or script of the Turbotax interview to follow along, unfortunately. But you can download the general tax instructions and copies of the IRS forms and schedules if that would help.
PDF 2022 Publication 17 - Internal Revenue Service
https://www.irs.gov/forms-pubs/about-form-1040
Also as stated, if your divorce was final on or before 12/31/22, you can't file as married. You would file as single, or perhaps head of household if you qualify.
