In order to take advantage of 120fps games, you will need to ensure your TV supports 120Hz, which effectively means it can refresh 120 times every second.
Unfortunately, just having a television capable of 120Hz isn't the end of the issue, as you'll also need to ensure your display is compatible with HDMI 2.1 and can support a data bandwidth of 48Gbps. Not all panels do, but because 4K HDR at 120fps requires 48Gbps, it's the only way to truly experience 120fps gaming on PS5.
For more information, refer to the Best 4K TVs for PS5 in 2022.