Doesn't sound to healthy, bummer.
Under the exhaust manifold near the rear on that side is a hydraulic tensioner for the timing chain, large hex bolt head on it, check to see if it is loose, or even unscrew it and pull it out to see what the end looks like.
This is what it looks like:
Other wise I would not drive it and at least pull the valve cover on that side.
If engine is cold you can remove fan belt and run engine for 1 to 3 minutes without water pump/fan turning, this reduces noise in engine bay so you can pin point a noise easier.