Best way to migrate existing database under Always on (2012) to new AG (2016) with minimal downtime (under 5 mins)

Hi Experts,

We are looking to migrate our existing DB server configured for always on (SQL 2012) to a new AG group with SQL 2016 with minimal downtime (under 5 mins)

Current Architecture(Windows Server 2012 and SQL Server 2012):

Node1 and Node2 (ABC data center with synchronous mode) and Node3  (XYZ data center with Asynchronous mode)

New Architecture (Windows Server 2016 and SQL Server 2016):

Node1 and Node2  (ABC data center with synchronous mode) and Node3  (XYZ data center with Asynchronous mode)