SBA recommends that businesses download the economic injury disaster loan paper application and start getting their documentation ready, so when that declaration opens, they can quickly get in their application.
This link on the SBA website has good information including the documentation required for these loans (people can download the paper application form before applying online so they can see what they’re going to need):
https://disasterloan.sba.gov/ela/Information/PaperForms
Declarations are listed here (you can see which states already have COVID-19 declarations) and more about the online application process when it opens for Tennessee firms: