I'm not aware of any site that will give you the status at this time.  However, you will get notification when it is pending.

To help everyone check on the status of their payments, the IRS is building a second new tool expected to be available for use by April 17. Get My Payment will provide people with the status of their payment, including the date their payment is scheduled to be deposited into their bank account or mailed to them. check irs.gov for updates on when this will be active.