If you need a hardcopy timeline, you will find it here: https://www.amazon.com/Robots-Foundations-Mapping-Asimovs-Galaxy/dp/1499569823
There is a book discussing the full timeline, but it does not include visuals. https://www.amazon.com/Robots-Foundations-Mapping-Asimovs-Galaxy/dp/1499569823
Interestingly enough, recently I found that there was an attempt to compile a complete timeline of Foundation/Robot universe in printed handbook form. (Of course it is another unofficial fan project, not acknowledged by Asimov estate or any other entity related to the canon)
https://www.createspace.com/4809102
http://codexregius.blogspot.com/2014/12/from-robots-to-foundations-book-trailer.html
I'm not sure how reliable or accurate this book might be, though. So if you want to give it a shot, please take a look at sample pages which are available through Amazon's 'look inside' option.