Create Postgres with knex.js trigger to update time after updating the table - postgresql

Question

I have a table with id, username, job, job_id, created_at, and updated_at columns. I used knex.js to create the table and I want the table to capture the time if there are any modifications on the table, for example, if the column job is updated from the frontend, the column updated_at should store the time at which the column was updated.
I am new to Postgres triggers, but I tried to implement this;
const FUNCTION_NAME = 'on_time_update';
CREATE OR REPLACE FUNCTION ${FUNCTION_NAME}()
RETURNS TRIGGER AS
$BODY$
BEGIN
NEW.updated_at = now();
RETURN NEW
END;
$BODY$ LANGUAGE PLPGSQL;
export async function up(knex: Knex): Promise<void> {
await knex.raw(createOnUpdateTrigger('jobs', FUNCTION_NAME));
}
export async function drop(knex: Knex): Promise<void> {
await knex.raw(dropTrigger('jobs', FUNCTION_NAME));
}
using knex, I created a trigger;
createOnUpdateTrigger: (name, table, procedure) => `
CREATE TRIGGER ${name}
BEFORE UPDATE on ${table}
FOR EACH ROW
EXECUTE PROCEDURE ${procedure}();
`
dropTrigger: (name, table) => `
DROP TRIGGER ${name} ON ${table};
`
by doing this, I am able to successfully create the migration, but my column is not being updated and I am not getting errors. I am not sure what am I doing wrong. Any help would be appreciated as I am new to this! Thanks!