To answer your question, a masters in B.Tech relies on the subject you pursue your masters in and its scope in the current scenario. However, in general, masters increases your probability of finding a good job, higher starting salary and gives you a helpful specialized learning experience.
However, if you choose to do masters only to have the degree, then it is advisable that you start working.
Well getting a Masters degree is always an advantage . You will be having an edge in terms of skills as compared to those not having Masters degree. But it is more helpful if you get some work experience of a least 2 years this will help you understand the concepts of your branch better.