A very simple method is to draw a Lissajous curve against a reference signal of 600Hz.
Another way is to demodulate the received audio signal with a 600Hz carrier, assuming you have set the CW pitch to be 600 Hz.
Note that in the scope plot the 1200 Hz component looks like a 80 Hz signal due to undersampling of the scope.
If a low-pass filter is employed to eliminate the 1200 Hz component, and if a perfect tuning is attained, you will observe a square wave corresponding to a dot or a dash. It seems the morse code was two dashes or the letter M.
You will also see that the half period of the filtered signal is around 0.3 sec, so the beat frequency is about 1.7 Hz. Unfortunately, you can not tell whether you should tune up or tune down from the figure. You need to do more sophisticated signal processing dealing with complex numbers, or analytic signals.