See this TurboTax support FAQ for printing the Form 4868 extension request - https://ttlc.intuit.com/community/printing/help/how-do-i-print-my-4868-extension-form-after-e-filing-it-through-turbotax-easy-extension/01/26520
How can i only print 4868...bc when i follow the process it asking me to complete the tax info
You will have to pay the TurboTax account fees for the edition you are using. Then you will be able to print out the Form 4868.
To pay the TurboTax online account fees by credit card, without completing the 2018 return at this time, click on Tax Tools on the left side of the online program screen. Then click on Print Center. Then click on Print, save or preview this year's return. On the next page, to pay by credit card, click Pay Now. On the next screen just click on the Continue button. The next screen will show a review of your Fees, click on Continue. Complete the next screen to pay by credit card and click Continue.