How long until all users are FORCED to upgrade to Signal 7.0.2 (enforced username use)

How long until all apps are FORCED to upgrade to Signal 7.0.2 (enforced username use)?As I understand it. People who havent upgraded can still view phone numbers instead of u / n's until they upgrade.Is this correct? Is it the same for iOS and Android?

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EDIT: Enforced for recipient if sender has username's turned on

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