Integration with Prox-1 took place the following day, on 7 May 2019. Nugent said the process only took 2 hours and went very smoothly. This was LightSail 2's second integration with Prox-1; the spacecraft was first integrated in March 2018, but launch delays prompted the team to bring the CubeSat back to Cal Poly so its batteries could be periodically charged.

In April, Alex Diaz, an engineer at Ecliptic Enterprises Corporation, updated the spacecraft's software, topped off the batteries, and performed an "aliveness test"—a series of checks to make sure the spacecraft responded properly to basic commands.

Prox-1 and LightSail 2 will soon ship to Cape Canaveral, Florida, where they will be attached to the SpaceX Falcon Heavy rocket flying the STP-2 mission for the U.S. Air Force. NASA, which also has payloads on the rocket, reports the launch is currently scheduled for no earlier than 22 June 2019.