FILING ITR of FY 2018-2019 in current year

No you cannot file return for AY 2019-20 now as date was already over. But filing can be done by getting approval from CIT

As per current trend in the way commissioners behave, i dont think it will be fruitful to apply before a commissioner. time limit for scrutiny notice has also expired.
there is remote chance that you will receive a 148 notice. otherwise you could go scot free without filing return and without paying tax.

You should file an application u/s 119(2)(b) of the I.T. Act to the jurisdictional PCIT/CIT quoting the reasons for not filing the return timely. If PCIT/CIT will satisfy with your reasons he/she will pass a order for the same and in response to this order you can file your return for A.Y. 2019-20.

Agreed