Based on my searches, there doesn't seem to be a way to get the total number of pages accessed by URL. Here is a reference on URL access parameters: [https://learn.microsoft.com/en-us/sql/reporting-services/url-access-parameter-reference?view=sql-server-ver16.
If you want to get the total number of pages, you can add a textbox in the header of the report, and then use the global variable TotalPages in the expression.
For more details, you can refer to this link: [https://learn.microsoft.com/en-us/sql/reporting-services/report-design/built-in-collections-built-in-globals-and-users-references-report-builder?view=sql-server-ver16.
Best regards,
Aniya