I have the same sound, looked been told it could be injectors, valves or timing chain. Any resolution to this? Toyota says valves should be checked and adjusted like every 60k miles but nobody really seems to do this service. Even calling Toyota dealerships and local shops they say it is not a common thing to do. Had a local mechanic listen to the engine for 30 seconds and he said it sounds normal, hard to really trust this though haha.

Here is a video of my 08 making a similar noise, much more pronounced on driver side.

Video Here:
2008 4runner 1GRFE ticking/knocking noise? - YouTube

What i think is odd with this is that it sounds normal when cold, but gets louder the longer it runs and warms up. Maybe this would prove the exhaust leak theory true?