Yes you can file gst return with late fees and interest. Late fees is waived off for July 17 to sep 17.
In this case, where taxpayers do not file their returns within a specified due dates mentioned, he is obliged to pay a late fee of Rs. 50/day i.e. Rs. 25 per day in each case of CGST and SGST (in case of any tax liability) and Rs. 20/day i.e. Rs. 10/- day in each CGST and SGST (in case of Nil tax liability) subject to a maximum of Rs. 10,000/-(both acts) , from the given due date to the actual date when the returns are finally filed.