Debian 9 sources.list

I have installed Debian 9 Stretch stable version today. I want to update my system. But I didn't find package list for sources.list. In the site, I found Debian 9 sources.list package. But this list for Debian 9 Testing. Can I use it for stable Debian 9? or where is Debian 9 sources.list? How can I update my system? Debian 9 was released yesterday. Do I need to update the system?