Can I file my taxes prior to a ROTH 401k over contribution being withdrawn?

My wife had two employers in 2020 and had an excess contribution to her ROTH 401k for the year as a result. We have been trying to get her current employer to back out contributions and it has not been a fast process. 

 

My question is, can we file our 2020 taxes prior to her current employer removing the excess or do we need to wait for a revised 2020 W-2? I haven't seen a direct answer to this question, but from what I gather it should be acceptable to file our taxes because any income/gains from the excess contributions will be taxed in 2021 income.