Webetainfo, known for releasing details about Whatsapp before they become public, announced that the dark mode was ready but no date had been fixed for public downloads by WhatsApp.
The feature has been rumored to be released to iOS users first before the other operating systems but no date has been fixed yet.
The dark mode helps to improve battery health and reduce eye strain when viewing the screen for longer periods.
Whatsapp recently released the latest beta version which has tons of awesome features you can try out.
The Android dark theme is ready, but personally I would improve the dark VoIP UI.
Yes, it is ready, but I've no idea when it will be released.
— WABetaInfo (@WABetaInfo) December 19, 2019