The phrase "in draft phase" is correct and usable in written English.
It can be used to describe a stage in the development of a document, project, or plan that is not yet finalized.
Example: "The proposal is currently in draft phase and will be reviewed by the team next week."
Alternatives: "in draft stage" or "in preliminary phase."
Exact(1)
Update: A Google spokesperson has provided the following statement (emphasis included): "We're working on some major updates to Gmail (they're still in draft phase).
Similar(59)
The plan is still in a draft phase, and there is no timetable for when the changes will be rolled out.
The plan, though still in draft form, is said to call for some of Newark's failing schools to be phased out and others to be consolidated.
In December, the hotel was still in its "rough draft phase," which meant the restaurant and bar weren't open and construction was continuing.
Not only can a smart contract save time and money in the drafting phase, but they can also cut down on some of the costs should one party want to dispute the agreement.
At present, physical genome resources for Astyanax mexicanus are in their early draft phases (McGaugh et al. 2014).
But the proposal has been stuck in the final drafting phase.
JSON Web Tokens are still in a draft-phase and currently immature.
However, absence of a given protein in the database does not denote absence in the organism because several of the queried genome assemblies are still in draft or assembly phase with low coverage (table 2).
(The movie, thank goodness, mostly eliminates the rough-draft phase, and there are no rooms full of crumpled up paper, as there were in "The Hours").
He was taken in the second round, (38th overall) in the January Draft, secondary phase in 1974 by the Phillies.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com