Donald,
2005 I had a triple bypass. I wasn't back to shooting trad at that time, just wheels. I have been an archer of one kind or another since about 1960 so my muscles have always been in pretty good shape. At 7 weeks post surgery my surgeon told me I was good to go and to resume my regular lifestyle BUT "take it easy". Start slow and see how you feel. You have the rest of your life to get back at it - go slow to start. Your body will tell you how far to go. In addition, you will most likely be in cardiac rehab post surgery, do the exercises and see how you do.