Devs when you are planning to go on exchanges? Maybe you are already negotiating with some major exchange?
I think this is a premature question. Towards the end of ICO usually this information appears. And is largely dependent on the success of the project.
I know a lot of projects which had planned the listing on exchange before the start of the ICO, in the case of successful completion. For example HOQU had an agreement with hitbtc it is during the presale.