onstream
adverb or adjective
on·stream ˈȯn-ˈstrēm 
ˈän-
: in or into production
plants scheduled to come onstream
Example Sentences
Recent Examples on the Web The only big developments are in the energy sector, which will see the $400 billion Power of Siberia gas pipeline come onstream this year. 
Fred Weir, The Christian Science Monitor, 6 June 2019
Fred Weir, The Christian Science Monitor, 6 June 2019 Word History
First Known Use
1930, in the meaning defined above