There is one more stage which is the Approved stage thats all, that denotes that you have been nominated, you get a notification in your EE profile inbox regarding the nomination and you have 30 days to accept or reject the nomination. to answer your second question, the standard time is 30-60 days give or take, no one can predict how many days it takes to change from one stage to another. Each application is handled by differently as it gets assigned to a different Visa officer mostly, so them some time, we cant rush the process. Even after you get your Nomination, getting an ITA and applying for it should be carefully done as they are even more diligent regarding the application, so everything needs to be exactly correct in your application.