Dimmer Installation and Neutral Wire Identification

Hi everyone, I’m trying to install my first smart dimmer, specifically the Enbrighton Zigbee model, but I’m running into some wiring questions. I currently have Lutron Diva dimmers installed, and the wiring setup looks a bit confusing. From the pictures I’ve taken, I can see a red and black wire connected to the existing dimmer, and there’s an additional red-black wire that’s not connected. I’m trying to figure out where to connect the red wire and if the white wire tucked inside the box is the neutral I need. Also, I don’t see a ground wire, which is a bit concerning. Does anyone have experience with similar setups or can provide some guidance? I’d really appreciate any advice or resources to help me get this installed correctly. Thanks in advance!