You can bid on whenever you want. The time does not matter. You only need to clearly give the information to the client tell about yourself about your skills and what exactly you can do for this project.
If the employer considers it necessary you will receive an answer for further communication but if not, you will have a million chances to get other projects.
Interviews only show that the client is trying to find the best candidate for this project.
Just be sure what you are doing and you will get more!