BizDev experts::What's the best way to reach out to big brands?

We are in process of developing a solution that solves big hurdles for large brands with multinational distribution. Example: PG&E, J&J, GE etc. What's the best way to reach out to them and get some early feedback so we can course correct and shape the product in a right way before its too late? Looking for some guidance and understanding of the process including the time it takes to close deals with large brands? Thanks