They also need to get details on the employers inability to pay, so your employer will have to provide more information, than just the form. You may have to chase your employer to provide this information. (it is the "Proof" that they can't pay)
The DETE have a web page all about this, google it and you will find it.
N.B. If your employer did not include the proof they will return the RP50 to them, and you may be none the wiser.
Ring the DETE to ensure they have received and registered your form on the system, and ask what date they received it on. They are dealing with a lot of paper work and some get lost...Ask them if they have all the information they need.
The DETE update their web page to show what month they are now processing. You can setup up a simple web page monitor for that page (google "webpage change detection"), which will send you an email every time they change the page, so you can see how things are progressing.