Kushal,
I realize I am late in seeing your question to reply but I wanted to drop in with a solution I think would better meet your needs and the needs of others who might find your question: Flow Designer has Do the following in parallel flow logic, which would allow you to configure multiple processes to be kicked off in parallel. The flow would then continue processing after all the parallel blocks have completed, working effectively like a join. No join action or flow logic is required.
I hope this helps you and others who read this post.
Ben
