It is good that you used a service that has assured you that the IRS received your mailed return. Now you have to be patient.
When you mail your tax return, wait about 4 weeks and then check the IRS site:
https://www.irs.gov/refunds
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**