Leathermang is indeed describing the correct timing chain test method, and if you want to be sure, you should follow his instructions. However, if you are turning the harmonic balancer slowly and stop exactly when the cam and cam stand marks line up, then you check the harmonic balancer mark and it is right on, you are probably okay.

It is entirely possible that your chain has no stretch at this mileage if you have been religious about FREQUENT oil and filter changes.

My 240D was very close to zero stretch at 380,000 miles, so I know that it is possible.

Merry Christmas,