How to get the test case execution status(pass/fail) after the test run?

For your assertions, take a look at Property Checkpoints:

https://support.smartbear.com/testcomplete/docs/testing-with/checkpoints/property/about.html

Here's some information about exporting log results.  See if this works for what you want.  If not, give us some more specific details about what you are trying to do and we can help further.

https://support.smartbear.com/testcomplete/docs/testing-with/log/working-with/exporting/about.html

I use this in an on test stop event handler:

function GetTestStatus() {
  Let result = "CHECK";
  try {
    if(Log.ErrCount == 0) {
      result = "PASSED";
    } else {
      result = "FAILED";
    }
  } catch(err) {
    Log.Warning(err);
  } finally {
    return result;
  }
}

 It returns the number of errors in the currently running test item.