On a Window's computer the Check File Status is under File, the first item on the LEFT. Open your return and go up to menu item
File > Electronic Filing > Check Electronic Filing Status
Then save your return with the status. Go to File-Save.
And When you efile you get back 2 emails. The first email only confirms the transmission. The second email says if the IRS (or state) Accepted or Rejected your efile.
There is also an Electronic Postmark page saying when you filed and when the IRS accepted it. You can find it in Forms Mode. Probably near the end. That is your proof and signature.
