makingahappylife

As long as it is signed, you can print the scanned copy. Here is the link and a quote from the Dept. of State website to support this:

https://travel.state.gov/content/travel/en/us-visas/immigrate/the-immigrant-visa-process/interview/interview-prepare/required-documents.html

"- A signed Affidavit of Support from your petitioner and any additional financial sponsors who submitted a Form I-864 on behalf of your visa application. Applicants may bring photocopies and scanned versions of signed Forms I-864 and associated documents. (Please note that the form must still be signed; typed names and electronic signatures will not be accepted."
 
(This can be found under the "Prepare for the Interview" section.)

There could be but still passport get delays due to various internal or printing reasons . I think just wait till this friday if you still don't hear anything then contact them. Sometime it takes  2 weeks or little over but definitely try to give them a call next week if you don't hear anything by this weekend.