What's the correct use of variadic function template here?

Question

I happen to compute the elapsed running time of various functions and algorithms in my research project, so, I decided to define an elapsed_time function which might take various type of functions with various number of arguments(if any) and also various return types or none (void).

I want to pass a function to this elapsed_time function and make use of a function pointer, pointing to the function that has been passed as an argument of the elapsed_time function, and thus compute its elapsed running time. I am not sure if my code is even close to be correct, but I did my best as a newbie in programming, as follows:

MWE:

#include <iostream>
#include <chrono>

template<class return_type, class  ... argument_types>
void elapsed_time(return_type func(argument_types ... args)){

    return_type (* func_ptr)(argument_types ... args) = & func;

    std::chrono::time_point<std::chrono::high_resolution_clock> start_;
    std::chrono::time_point<std::chrono::high_resolution_clock> end_;

    start_ = std::chrono::high_resolution_clock::now();


    /* Put the Function whose elapsed time matter right HERE */
    func_ptr(); /// What to pass here?
    /* Put the Function whose elapsed time matter right HERE */



    end_ = std::chrono::high_resolution_clock::now();
    std::chrono::duration<double> elapsed_time (end_ - start_);
    const double seconds(elapsed_time.count());
    cout << "\nRuntime: " << seconds << " s\n\n";
}

and now lest consider I have a function to be passed to elapsed_time function, as follows:

vector<Point_CCS_xy> fun(const vector<Point_CCS_xy> point_vec, const Point_CCS_xy inquiry_pnt, const int sz);

where Point_CCS_xy is a class of cartesian coordinates (x,y), i.e.,

struct Point_CCS_xy {
    long double x_coordinate;
    long double y_coordinate;

};

My questions:

1. Is the function I have written correct? what should I pass to func_ptr() as commented in the body of the elapsed_time function? Passing argument_types ... args leads to the error: 'argument_types' does not refer to a value
2. In the main(), how to pass vector<Point_CCS_xy> fun(const vector<Point_CCS_xy> point_vec, const Point_CCS_xy inquiry_pnt, const int sz); function to the elapsed_time function?

In advance, I appreciate that you share your thoughts and comments.