all systems go
used, sometimes humorously, to say that you are ready to do something or that something is ready to happen

[TahlilGaran] Dictionary of Contemporary English ▲

all systems go
(it's) all systems go
everything is ready for something to begin.
Once the new software is installed, it's all systems go.

something that you say which means everything is ready for a piece of work or period of activity to start.
We've just got to get the software put in place and then it's all systems go.

[TahlilGaran] English Idioms Dictionary ▲

all systems go
everything is ready (originally used when a rocket was launched)
It was all systems go so we began the installation of the new computer system.

[TahlilGaran] English Idioms Dictionary ▲

all systems go
Originally from space English, now general colloquial usage. Everything is complete and ready for action; it is now all right to proceed.
After they wrote out the invitations, it was all systems go for the wedding.

[TahlilGaran] English Idioms Dictionary ▲