How to make Bull jobs concurrent

Question

For the context, I'm new to Bull (https://github.com/OptimalBits/bull) and trying to execute a lot of jobs concurrently. But Bull seems it'll wait for one job to complete.

Here is my code

const Bull = require("bull");


const jobs = new Bull('jobs');


jobs.process(async (job) => {
  const wait = ms => new Promise(resolve => setTimeout(resolve, ms));
  console.log(`start job.id = ${job.id}`);
  await wait(3000); // Wait 3 seconds.
  console.log(`end   job.id = ${job.id}`);
});


void async function main () {
  for (let i = 0; i < 10; i++) {
    jobs.add({});
  }
}();

If I ran this code, it'll take 30 seconds to execute, one job after another. What am I doing wrong and how to make this concurrent?