That is great news. Welcome to the "erection with catheter still in club".
I had my first post op erection after 5 days with cath still in. Yes, ouch. But I was glad to have it. Good idea to wait 2 weeks before sex. Those orgasmic spasms can really stress the surgery. You will be pad free real soon.
As for the erections, keep blood flowing into your penis as much as possible. You really are lucky and you will realize how much in 2 weeks with your wife.