How to make a custom category archive page display names for each of terms when displaying a page showing more than one

I have a custom page for a specific custom category which was derived from archive.php. On this page I have a "Search and Filter" (plugin) set of checkboxes which allows for a selection of one or more categories and the results are then displayed. This all works well.

I’m using a custom category (added with Pods) called "rk_themes" and labelled as "Themes".

I need to show the term names that were selected in a status line along with the number of results. It should show “10 works found for Category Name A, Category Name B”.

The URL for this is like https://example.net/theme/category-name-a+category-name-b

Showing the count is easy enough, but I can’t figure out how to access the term names. A var_dump of WP_Query suggests there is only a label for the first term.