Can I close this and print my returns tomorrow because our printer doesn’t work and the library isn’t open until tomorrow?

Yes...your work will be saved and you can return to work on it tomorrow or print it tomorrow.   In order to print, you have to pay your TurboTax fees using a credit card or debit card.

https://ttlc.intuit.com/community/printing/help/how-do-i-print-and-mail-my-return-in-turbotax-online/00/26258

When you mail a tax return, you need to attach any documents showing tax withheld, such as your W-2’s or any 1099’s.  Use a mailing service that will track it, such as certified mail so you will know the IRS/state received the return.

Federal and state returns must be in separate envelopes and they are mailed to different addresses.  Read the mailing instructions that print with your tax return carefully so you mail them to the right addresses.