The only difference between PROCESSING and STILL PROCESSING is a time factor. Once the return has be "processing" for 21 days or more the WMR? tool will switch to the "still processing" notification automatically. How much longer the return needs to process is unknown by even the IRS themselves and all you can do is wait patiently.
FYI ... that WMR? tool is often incorrect meaning that you can have your refund in your hand and the tool still say processing so don't worry about that too much.
