I’ve been on Accutane 6 months, but to keep my skin clear I want to use tretinoin topical. How long should I wait?

I’ve been on Accutane for 6 months (40mg first months and 60mg for the rest 5 months). It’s been almost 2 weeks since I stopped taking Isotretinoin orally. I want to use Tretinoin to keep my skin glow and clear, so I wouldn’t breakout or see signs of aging. How long should I wait to begin using Tretinoin. My doctor prescribed me Tretinoin Cream 0.025%? I just don’t know when to start to use it.