The fact that you have an open workman's comp claim does not, at least in most cases, preclude or delay a lawsuit against your former employer for wrongful termination. Worker's comp is insurance that provides benefits for worker's who are injured on the job. The state requires employers to have worker's compensation insurance, sets the rules for it, and provides for the process to resolve disputes over the coverage between the employee and the worker's comp carrier. See the California Division of Worker's Compensation for all kinds of information on Worker's Comp in that state.

Unless you are claiming that the wrongful termination was related to you filing the worker's comp claim there is no connection between the wrongful termination lawsuit and the worker's comp. So if your claim is that the employer illegally terminated you because of, say, your race or sex, that has nothing to do with the worker's comp claim. The process and the time you have to pursue a wrongful termination claim will depend on what you claim is the reason the employer wrongfully terminated you. What is the reason the employer said you were fired, and what do you think is the real reason, if different from what the employer said?