40yr. old male 3 months out from hybrid maze ablation surgery for afib with pvc's 13% of the time , is it safe to lift heavy & resume road bicycling ?

Yes: No restrictions should exist after 3 months.

Should be fine: Since you went through a significant procedure, you should ask your cardiologist. The pvcs likely do dot represent a big risk. Perhaps they will get better. If not, they can be left alone, treated with mess or ablated. In the end you went through this so you could have a normal life. I'd say you should do what you can to get back to it.