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The flagship application at a company is deployed on Amazon EC2 instances running behind an Application Load Balancer (ALB) within an Auto Scaling group. A DevOps Engineer wants to configure a Blue/Green deployment for this application and has already created launch templates and Auto Scaling groups for both blue and green environments, each deploying to their respective target groups. The ALB can direct traffic to either environment's target group, and an Amazon Route 53 record points to the ALB. The goal is to enable an all-at-once transition of traffic from the software running on the blue environment's EC2 instances to the newly deployed software on the green environment's EC2 instances. What steps should the DevOps Engineer take to fulfill these requirements?