I was in the same boat as you a few years ago and decided not to do it. My room mate started airline apps when he was at 400 hours and took his ATP written between 400 and 500 hours. He ended up getting an interview with Skywest the day he hit 1000/100. I got airline apps done but got busy with work and life and had to put off the ATP written for a few months. By the time I finally took it I was over the mins by about 200 hours. I got an interview right away but class dates were backed up by up to six months. My class date was almost 6 months after my interview.

There ended up being 8 months difference and 250 seniority numbers between me and my room mate and we both had the same amount of flight time and worked for the same flight school. I could have been sitting next to him in class.

If you have time now to get airline apps done and get your ATP written done then do it. You won't get an interview right now but you will have it done. You never know what might come up in your life a few months down the road that will eat up your free time. Seniority is everything. I would be 250 higher up on the list if I had gotten my apps done earlier.