Your marital status for the whole year is what you were as of midnight Dec 31, 2020. It does not matter if you were married on Dec, 31 you are still married for all of 2020.
If married, then your only filing choices are Married filing jointly or Married Filing Separately. Separately has many limitations and the overall tax will probably be higher.
**Disclaimer: This post is for discussion purposes only and is NOT tax advice. The author takes no responsibility for the accuracy of any information in this post.**
