'prime stage' is correct and usable in written English.
It is often used to refer to a critical point or period in the development of something, such as a business or career. For example: "He's at the prime stage of his career, with his latest album becoming a hit."
"Her age makes it exciting, not just because she's quite youthful but because she's also in this prime stage of life when so many women feel they have to step out or step back".
Lincoln Center has received a $16 million grant from the Alice Tully Foundation toward the renovation of Alice Tully Hall, the center's prime stage for chamber music and jazz.
Once an enterprise reaches its prime stage, the manager needs to be result-oriented and should show proper planning and coordination skills.
As shown in Fig. 3A, while zebrafish IGFBP-1a mRNA was easily detected throughout embryogenesis, IGFBP-1b mRNA was not detectable until the prime stage (25 hpf) at low levels.
As many as two million refugees had flooded into the North-West Frontier Province, turning Peshawar, the capital, into the prime staging area for the resistance.
The prime staging requirement is adjacent theaters, and as it happened, Mr. Falls had two such houses he was looking to fill.
Honolulu became a prime staging area for the remainder of World War II, a position it retained during the Korean War and until the end of the Indochina Vietnamm) conflict in 1973.
Local bands, such as Black 47, which is at the B.B. King Blues Club & Grill this weekend, get prime stages, or they hit the road (the Prodigals, who have been found at Paddy Reilly's every Friday night for more than a decade, will be at the House of Blues, in Cleveland).
As well it should have; located prominently at Broadway and Wall Street, Trinity was a near neighbor of the World Trade Center, and its satellite St . Pauls Chapel, a few blocks up Broadway and directly across from the Trade Center grounds, served as the prime staging area for rescue workers.
The four prime stages in the HTE approach are introduced, in the specific context of work on zeolite synthesis.
For Istanbul Passage (2012) he turned to "a neutral city near the Balkans, a perfect listening post, a mecca for spies and a prime staging area for the Mossad in helping rescue trapped European Jews".
