If you have ample space in the run or they free range I would do it now. I don't introduce chicks I've brooded until they are around 12 weeks old, but I like to put the ones that have a mamma in sooner while she is still feeling protective. If you have lots of other chooks or space is tight you do run the risk of one or more of the chicks getting seperated from mom and pecked badly (even to the point of death) but in my experience mom will "take care of business" as long as she has enough room and not too many other chicks get ornery at once.
Take a look at your set up and evaluate your birds aggresion level and then if you "think" it will be ok go ahead and put them together, but be sure to do it when you can spend some time watching. If you see excesive aggresion or targeting of the chicks remove the family and try again when everyone is older. I haven't had a problem, but I free range and they have plenty of room. Good luck.