I would also mention replacement, especially in the beginning is something to consider. Yes you want to give up porn but with that freed up energy and time what do you want to do? Something you look forward to. If you spent 5 hrs a week (that was about what my hubby would spend sometimes more) on porn then that is 5 hrs a week that you can do something else. He started spending more time with our kids. Reading to them and engaging with his family. Then when you feel tempted remind yourself yes you have a desire for porn but you are choose something better, more constructive, and that can help shift your thoughts. Rather than focus on what you can't have, think about the life you want to have. Porn is all about shame, hiding, lies, objectification. Think about becoming the person you want to be. Think about the role model you want your kids to have. Make a real list and carry it around with you. It starts to become real then. When a temptation or urge comes up you can look and see the real choice in front of you.
Keep up the good work. I am a partner of a porn addict and I can tell you that I am so glad my husband gave it up. But I am also so thankful of the honesty we have now too. If you do decided to tell her I would encourage you to show her the partners forum for support. The beginning isn't easy but it is worth it to have real honesty and integrity in a marriage. Assuming she knows and actually communicating are two very different things. Having to be accountable to more than just yourself in your reboot will make the temptation of porn less tempting to know that it is not just impacting you but your wife as well. I am not trying to be hurtful or anything, just stating my experience. Take it or leave it. I wish you the best and will pray for you and your wife!