Ok so i havnt yet filed for 2018 or 10 and am wondering if I file fof an extension i ffc my federal government stimulus money will be sent to me sooner

"...or 10..."?      Was that a typo---do you mean 2019?

The IRS is using returns for either 2018 or 2019 to issue stimulus checks.  A 2018 return has to be filed by mail--it cannot be e-filed now.  Only a 2019 return can be e-filed.  The filing deadline for a 2019 return is July 15, 2020.  If you owe tax due it has to be paid by then.  If you ask for an extension for 2019 that gives you until October 15, 2020 to file the return, but no extra time to pay---you still have to pay by July 15, 2020.

Online preparation and e-filing for 2018 is permanently closed.

To file a return for a prior tax year

If you need to prepare a return for 2016, 2017, or 2018 you can purchase and download desktop software to do it, then print, sign,  and mail the return(s)

https://turbotax.intuit.com/personal-taxes/past-years-products/

Remember to prepare your state return as well—if you live in a state that has a state income tax.

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 UPS or certified mail so you will know the IRS/state received the return.

Note:  The desktop software you need to prepare the prior year return must be installed/downloaded to a full PC or Mac.  It cannot be used on a mobile device.

If you are getting a refund, there is not a penalty for filing past the deadline.  If you owe taxes, the interest/penalties will be calculated by the IRS based on how much you owe and when they receive your return and payment. The IRS will bill you for this; it will not be calculated by TurboTax.

https://ttlc.intuit.com/questions/1900990-how-do-i-file-a-prior-year-tax-return