What do I do if I filled my return using itemized deduction and I need to amend to standard deduction?

I have already mailed the return (2 weeks ago). It's a past return (2017) and I've also paid (I owed because I used itemized deduction).

I'm pretty sure if I use the Standard deduction I will not owe but get a refund instead.

Will the IRS also return my money?

Thank you!