How to get projectsiteurl of a published project

I am using csom to get project site url of all projects in project server 2013(online)

i tried p.ProjectSiteUrl which ends up throwing an exception  " property or field 'ProjectSiteUrl' has not been initialized. it has not been requested or request has not been executed it may need to be explicitly requested  "

foreach (PublishedProject p in projContext.Projects)
    {
                      
       Console.WriteLine("Name : "+ p.Name +"\n url :"+p.ProjectSiteUrl);

     }

Ranjith