The phrase "a key time in" is correct and usable in written English.
It can be used to refer to an important or significant period in a particular context or situation.
Example: "The 1960s were a key time in the civil rights movement, marking significant progress towards equality."
Alternatives: "a crucial period in" or "an important moment in".
"These items are artistic riches, extraordinarily preserved from a key time in Maya history.
The more C4 activity an animal had, the more connections between cells were eliminated at a key time in development.
Unfortunately, the results and performances of the team appeared to be deteriorating at a key time in the season".
However, while prison destroyed Oscar Wilde and he never wrote anything significant again, prison was a key time in Verlaine's life in terms of creativity".
However, she only teases the reader with a few "pearls," or anecdotes, and that's a loss, given her pioneering role during a key time in journalism history.
"Unfortunately the results and performances of the team have not been good enough and were showing no signs of improving at a key time in the season.
The notable exception is at day 10, when CYAN (2.5 log2 fold), amoA (3.2 log2 fold) and narG (0.49 log2 fold) are greater in the successful cultivation and likely a key time point in granulation success.
The protests come at a key time for Amazon in the region.
"We thank Matthew Rees who has done a great job over the past two seasons as captain at a very key time in our progression, bringing a level of mental toughness and setting high standards in leading our squad".
We had scheduled maintenance that would have been during the middle of the night, the off-peak hours for us, but it happened to be during a very key time in Iran, and we ended up putting that off a day so it was more in the middle of the night there.
The news of how a specific country might take action against Google comes at a key time for the company in Europe and its search ads business.
