Use the form 7004 to get an automatic 6 month extension for an 1120-POL.
See the instructions at https://www.irs.gov/instructions/i7004
The form is at https://www.irs.gov/pub/irs-pdf/f7004.pdf.
If you have TurboTax Business, you might find the form there, but you might as well print the IRS form, fill it in, and mail it tonight.
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Don't forget to read the Instructions for F-7004 to obtain the correct mailing address for your jurisdiction.
Forms F-7004 have not been eligible by IRS for e-file as of yet and must be physically mailed. Meanwhile you may be likely tardy for today's postmark deadline. Good Luck!