Yes, 200 Mbps is a very good speed for a smart home. It can handle multiple devices and activities at the same time, such as streaming video, online gaming, video conferencing, and smart home automation. With a speed of 200 Mbps, you should be able to download large files quickly and stream high-definition videos without buffering or lag.
However, the actual speed you experience may depend on various factors such as the quality of your home network equipment, the number of devices connected, and the amount of data being transferred at any given time. It's always a good idea to test your internet speed regularly to ensure that you're getting the speeds you're paying for.