Congratulations and nice car Holson! I used to have an '87 Celica with the 3SFE engine. The rule of thumb I used in regards to the timing belt was to have it replaced every 100,000 KM (60,000 miles); cheap insurance - compared to it breaking!
It's quite a job, mainly due to the limited space; which is why I used to have the waterpump replaced at the same time.
That model should have the 5SFE engine, which is the same engine used on some 4 cylinder Toyota Camry's. Since there is no sticker indicating the belt change, I recommend having it done asap given the mileage.
BTW - these are great cars to have! Good luck!
