It is very simple, you follow all the blog sites and announcement channels for most of the exchanges.
And in that manner, you will get to see those coins that are going to be supported and listed on those exchanges.
Yes this is one way to know such. Constant visit to the exchanges, you can have an idea. So you can save your choice exchanges on your home screen for easy view and access.
The project team itself will share this on their social media and announcement platforms.
This is another solution to it. Through the road map, the team can list some exchanges they wish to list on. Although this is not trusted always because teams can mention high profile exchange just to win investors to buy their coin.