Louisiana Public Notary Question

I'm potentially selling my vehicle today and signing the title over to the buyer. However, we're meeting around 5:30 when most public notaries are closed. I went to a lawyer in my office building to get it notarized beforehand but he wasn't confident on what to do since the odometer and buyer info wasn't filled in yet. I didn't want to fill it in because what if the buyer backs out.

My question is... Are you solely notarizing my signature? Or that I provided the odometer reading as well?