Indoor When to transfer into Dwc

[afrazer651]

Have 2 Barney's sour diesel atuos that have just popped and am wondering when to transfer to 12L Dwc

 

[afrazer651]

 

[Free Flow]

When the roots start to poke out of your plug

 

[afrazer651]

When the roots start to poke out of your plug

Thanks man
A root has started to pop out the bottom about a cm. I have 2 as it's my first ever grow and planned to keep one. The other one has no roots yet but is staring to spread. So do you think I should transfer the strong one and keep the other one a while before I toss it