Hi and welcome to Just Answer!
If you filed electronically on Oct 15 - you may expect your tax return to be already processed. You may verify your status here - http://www.irs.gov/individuals/article/0,,id=96596,00.html
If you file a paper return - it should be processed in 6-8 weeks after accept date.
If your tax return was selected for verification - the process time might be longer.
There is no way to could speed up the processing time.
You may order tax transcript - including information about your income - even your tax return was not processed.
You need to use the form www.irs.gov/pub/irs-pdf/f4506t.pdf to obtain your tax account transcript.
Please be sure to check
box 6b - Account Transcript, which contains information on the financial status of the account, such as payments made on the account, penalty assessments, and adjustments made by you or the IRS after the return was filed.
box 8 - to include information about your income.
Generally - for the loan application - you only need to confirm your income.
The IRS doesn't issue certified transcripts or anything that makes transcripts "official" documents.
However - you may request the transcript to be mailed to a third party directly.
Let me know if that is acceptable.