Will my taxes be mailed back to me automatically after filing with turbo tax

Are you asking about your refund?

Yes I am asking about my 2018 tax return

Your tax return or your refund?  The tax return is the 1040 form you filled out and filed.  Did you efile?  Was it Accepted?  You can check your efile status here     <a rel="nofollow" target="_blank" href="https://turbotax.intuit.com/tax-tools/efile-status-lookup/">https://turbotax.intuit.com/tax-tools/efile-status-lookup/</a>

Then IRS Where's my refund <a rel="nofollow" target="_blank" href="https://www.irs.gov/refunds/">https://www.irs.gov/refunds/</a>
Make sure you are using the refund amount from your actual federal tax return and not the combined amount Turbo Tax showed you at the end.  That was for federal and state combined.

Once your filing is Accepted, then the processing is in the hands of the IRS and state.  Plan on at least 21 days.

https://www.irs.gov/refunds/tax-season-refund-frequently-asked-questions