The copyright notice on the page at the link is 2013, so it looks like it would preceed TT’s sermons.
I’ll have to say that I’m not a particular fan of either Keller or TT. I’m more inclined toward Sinclair Ferguson/Ligon Duncan/Richard Pratt.
I have been in the pew for both Keller and Ferguson. I find them both outstanding, in different ways of course.