Can I schedule a load test with loader?

Yep! Click the "Schedule this test" button when creating a test, or select the "Webhooks & Schedule" tab on a test that is already saved:

When you set or update the schedule, you can set a date & time to run the test, and select the days you want to repeat it on (see image below). The date and time should be in your local timezone; the test will run at the time you set in your local time (or whatever timezone you have set in your loader settings).