Biometrics for 309 Visa

Do my husband and his son still have to do their biometrics?

I can’t find any info relating that they have to do that on the 309 step by step guide in the Immigration Website.

If they have to do that, can they do that with just the HAP no before they apply for their visa, like the health check or do they have to wait for a letter from the CO after submission of the visa?

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