Uk sources all seem to say wait 6 weeks for anything.
If you look say at most us sites, 2-4 weeks for gentle exercise but the harder the exercise the longer you wait… Upto 10-12 weeks for really heavy weight training around the chest but basically take things gently and see how it goes if it hurts stop!! One of the main issues as well is check if you are numb!! If oh have numb patches near your cuts you will have no idea if you are injuring yourself so be very careful and check often if you have any numb areas… Visual inspections