When will BCN be delisted from poloniex? 
Why poloniex must delisted BCN ? Where are you saw this news ? At this time BCN will delisted from Binance and this is very bad for this coin Now I saw a tweet that OKEx is delisting BCN, (a screen on facebook) is this true or is just a fake news?
https://support.okex.com/hc/en-us/articles/360006669892-Bytecoin-BCN-Now-Available
If you have your coin on that exchange than this article will be helpful for you to let know about the deadline of wallet removal. This is true news so take action on the right time before it get too late.