How to add Zbuffer to Custom Surface Shader

I am New to Shader. Zwrite ON not working with this Surface Shader

SubShader {

     Tags
     {
         "Queue" = "Transparent"
         "IgnoreProjector" = "True"
         "RenderType" = "Background" 
     }
     LOD 200
         
         
     CGPROGRAM
     #pragma surface surf Lambert vertex:vert addshadow no alpha
             struct Input 
     {             };
             void vert(inout appdata_full v) {   };
            void surf(Input IN, inout SurfaceOutput o)   {   };

this is the Structure I am Using. Help me write Z depth for this Surface Shader

I tried with Render Queue Value its affecting overlaped and intersected mesh. Also refer me study material for shader programing