Is it possible to file revised-return (with 10e information) post processing of itr ?

You can file revise return for FY 2017-18 until 31.03.2019.

Is revised return possible after the processing was complete?

Processing u/s 143(1)  is not completion of assesment.

When Notice is issued u/s 143(2) and processing is over u/s 143(3) then assesment is complete.

untill then you can file u/s 139(5) if 139(1) or 139(4) is filed and processed for Ay  2017-18 and after.

Rectification u/s 154 can be done upto four years from the day of assesment.