Qatari 777 Freighter

"My side, below." Closing speed 970 knots (1,790 kph).

A few seconds the oncoming aircraft was a dot.

To tell if you are on a collision course, note if the dot is moving in your windscreen. If it is, you will miss.

If it is stationary, you will hit.

Then it's time to check the TCAS and see if there is the required 1,000 feet vertical separation.