As always
It is done when it is done
Here is the crude overview of steps needed

1 three prototypes need thorough checking

2 things found in 1 debated

3 things from 2 worked on by LT

4 if it seems OK LT sends out seven prototypes or samples for scrutiny
4a in case of any doubts 1 or 2 prototypes are send to us
4b, repeat 2 and 3

5 the team decides if they are prototypes or samples
5a still no good? Repeat 2,3 and 4 (unlikely but still)

6 whole team declares samples and GO is given

7 LT prepares the GTs and people start ordering.

That is it.