Cancellation of gst registration under composition scheme

Please note that only persons who are required to file return u/s.39(1) are required to furnish FInal return u/s.45. Persons opted to pay tax u/s.10 are covered u/s.39(2). Hence no need to file Final return also. Indeed, G.S.T.R-9 has to filed before applying cancellation for registration under GST

Thanks.

The facility for GSTR 9 of FY 18-19 not available at GST portal right now.
If person didn't  apply for cancellation of registration now,he will have to file GSTR 4 for Q1 of FY 19-20.
Shall I apply for cancellation of registration now or wait for updation of portal of GSTR 9 for FY 18-19.

Thanks in advance.

Apply for cancellation of Registration. No need to wait until the filing of G.S.T.R-9. If the department did not accept your application for cancellation then lets search for other ways.