Test Automation - Is My Project Over?

If I run my test automation project and it's successful and I reach my complete test coverage, it's complete as I choose to make it. Okay, so of course that you have to cover the new features as well. And typically you'll also need to change and maintain the existing tests if some features change accordingly. It's better to do it upfront and not wait until you get to nearly full coverage before you begin to automate the new features. This is because it's much more valuable to write the tests. Also easier to maintain when the tests are written alongside the features.