Call me overly optimistic if you will, but I think upgrade eligibility times for a new hire today can be as low as 15-18 months, at least in the 200. You will be off reserve in 2~3 months, and if you bid to fly, should be able to hit the magic 1,000 in that amount of time. Unlike most places, Endeavor wants you to have 1,000 hours with the company, not just 121 time, so even if you came here with 1,000 121 hours, you'd still need the 1,000 company hours.
Now will you actually upgrade right at 1,000 hours? That is a function of seniority movement, which is hard to predict, and personal ability. I'm not so sure that I will feel ready to be a CA at 1,000 hours. I woouldn't upgrade until I knew I was ready for the responsibility. There's a lot more to being a CA than a larger paycheck, obviously.