LST 12/12 when to?

so.. i was wondering when can i start LST'ing my 12/12 plants.. im only doing it coz im moving out in 1 month and a half and i wanna put em in boxes so no one see ofc.. last grow they reached over my ribs.. so it would be imposible to move plants that tall.. recommendations?

btw they are a week old. 4 inches tall.

I start lst training at around that height. However you see fit. I bend it over and tie her down and bring the light a little closer and repeat when the time comes.