Yes, the ITIN request (W-7) is filed with your tax return. And yes, he must include his 'Worldly Income' if you intend to file Married Filing Jointly. The full instructions with the steps you need to take can be found in this Help Article - the first option - MFJ with a Nonresident NRA Spouse.
How do you get an ITIN number for your spouse? - IRS - ITIN request process options.
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