Keeping in line with their monthly security update schedule, the BlackBerry Security Incident Response Team on Twitter has now let it be known that BlackBerry has begun their rollout of the April Android update. Once downloaded and installed, you should see your security patch level set as April 1, 2017, or later.
It generally takes a few days for all devices (Priv, DTEK50, DTEK60) to start seeing the update plus, devices purchased from other retailers and carriers are dependent upon their own schedules for release. With that in mind, you can check to see if you have any updates available but if you're not seeing it yet, hang tight. It will be along shortly.