That's great, hopefully it works as well for you as it did for me. It took me about 7 months to reach extinction and I haven't drank or had any cravings in almost 8 months now. I no longer drink because it ruined my health, but it's nice knowing that with the Sinclair Method if I did in the future it wouldn't spiral out of control.
It's great that it's already helping, but don't be surprised if your drinking and cravings increase a bit early on since naltrexone works by blocking dopamine from being released which is what your brain is actually craving when it convinces you to binge drink. Once you reach extinction though your brain no longer associates drinking with dopamine and pleasure, and your cravings will disappear.
On days when you're not drinking and taking naltrexone be sure to find healthy alternatives to drinking that give you more moderate amounts of dopamine and require a lot more effort to achieve compared to alcohol which is minimal effort for maximal reward. That way when you reach extinction and realize that alcohol + naltrexone will never satiate your natural cravings for dopamine, you will have healthier alternatives like hobbies, exercise, relationships, etc. to turn to instead of giving up on naltrexone and the Sinclair Method and returning to binge drinking for it's unlimited source of dopamine.