Hello Julie,
The filing status you would use on your return would be your marital status on 12/31 of that tax year.
If the divorce is not final you can still file married jointly, married filing seperately or head of house if you have a qualifing child.
If the divorce is final you would file as single or head of house if you have a qualifing child.
When filing seperate or single only your yearly income gets report on the tax return