Not clear from your post if/when TB was done previously and what else was done at that time, especially the water pump. If done at 90k, as recommended, you are not due on the TB until 180K. They are not prone to break, and rarely break on their own. That is, TB breakage is more commonly associated with WP seizure or leakage, idler seizure, tensioner failure, cam or crank seal failure, etc. IMHO, it is as important to get in there periodically to verify these other things as it is to just change the TB.
I deliberately waited until nine years and 120K to do mine, but then I did TB, WP, both idlers, tensioner, as well as accessory belts, thermostat and hoses. I plan on not going back in until 240k, and I will do the same thing, plus cam and crank seals. Everything I took out at 120K looked good for more miles, including the TB, but I don't know about going 240k. (I won't do the tensioner next time, that's the one thing I think is good for 240K and it adds a lot of work to the job).
In your case, it makes a big difference if your current WP has 136K or 46K on it. If it has never been changed, as well as the idlers, then I would get in there and see what is going on and probably change the TB, WP, and idlers no later than 150k. If WP was changed with TB at 90k, you can probably go to a 120k interval and do them both at say, 210K. If not even TB was done, then do it all now. The TB is recommended 90K interval, but my dealer has it as a separate job, not simply part of the 90K service--I don't know about yours.
This is my own approach. 120K interval and then change everything. I just think it makes more sense to change the TB a little less frequently but do more when I do it. There is a monster thread on YT with everyone's TB experience. Many people wait until 160k or more to change. There are almost no cases of the TB breaking on its own even at those mileages. There are lots of cases of problems due to WP's in the 120K-180K area--hence my approach. Time will tell if I am right--use your own judgment. I spend a little more on parts (all OES off e-bay), but the longer interval more than compensates.
Here is the YT mega-thread:
Linky