If your return is pending, you should be fine. Your submitted e-filed return doesn't need to be accepted on May 17 for it to be considered on-time. As long as you transmitted your return by 11:59 p.m. local time on May 17 you should be fine.
If your return is rejected on May 17 you'll have through May 22 to re-submit your federal return by e-file, or mail your return.
@Anonymous
As long as you transmit your return before midnight, May 17, your return is considered timely filed even if it takes a few days to get accepted. The Electronic Postmark is a timestamp of when your return was transmitted. Here's how to print out a hard copy for your records:
TurboTax Online
TurboTax CD/Download software
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