An hourly chart of $TLT shows how it maintained the current uptrend channel this week. Breaking down from this uptrend channel (marked with blue lines) would likely indicate a turn or even the beginning of the long-awaited trend change.
Here's a weekly chart that I first set up tracking a head and shoulders that formed when the long bond reached $150, and many thought it crested out there. Eventually it dropped to a 78.6% retracement to its prior low, then started back up again. It reached a 1.382% extension at $160-$163, and then yet another at $170-$172 -- and now the 1.618% extension of its 2015 range at $176.27 (at least, closed 21 cents away from that on July 8, 2016).
The next chart is a closeup of the updated monthly view of the 30-year bonds index $USB (which prices similarly to although not exactly the same as the futures $ZB_f), also noting the $127.27 level that has just been virtually tested (or may be tested on a closing basis soon).