Yes it can,
The procedure is different though how you opened the RAW file.
1. when opening from within Apple Photo’s by using the extension, after your edits just click at the “save edits” at the top right of the window.
2. When opening the RAWPower browser and choose “New Photo Library window” you can perform your edits and then click “Done” (it’s at the same place as the “edit” button top right)
3. When you open the raw directly in Raw Power. after editing you can use “File-> export to library”. The photo will be sent to your photo system-library.