What I would suggest you is to set clear and unambiguous expectations with your manager, the following questions might help you in that:
Have a conversation with your manager and have these points in writing as a "contract" you can use as the basis of collaboration.
I believe the most important thing is to understand what agile means for your team. - As a concept: being able to move in an incremental way. Find the best "first bite" of each project that can be delivered quickly and iterate on later to be improved. - As a tool: Kanban, Scrum etc. These are frameworks, use whatever fits you best, and feel free to be flexible as long as the concept part is solid.
Your manager (speaking of personal experience here as an EM) most probably want to build a more independent team which depends less on the EM support and can move forward in most situations by on its own.
Also a very important question: based on the conversation with your manager, make sure you really want this. Being a SM is a facilitator role, your task will include helping and nudging your team. Some people love this, some people hate it. It's hard to say no for your manager, but if it's not your cake, you shouldn't engage as you might burn out in the process.
Resource wisely, I can recommend these: