The phrase "about half completed" is correct and usable in written English.
It can be used to describe the progress of a task or project that is approximately 50% finished.
Example: "The construction of the new library is about half completed, and we expect to finish it by the end of the year."
Alternatives: "roughly halfway done" or "approximately 50% finished".
With the reconstruction of a united Berlin now about half complete, the city is still enmeshed in debate over whether the capital should exercise dutiful restraint or is now free to give exuberant expression to German power, as this Chancellery might suggest.
The development of King's Cross in London, now about half complete, is the most substantial fulfilment yet of an idea that the best way to transform an urban area, and to improve the lives around it with facilities and investment, is for commercial development to take the lead, while working closely with local authorities and local communities.
Currently, ∼11% of X-chromosome genes are implicated in XLMR; however, apart from a few notable exceptions, most contribute individually to <0.1% of the total landscape, which arguably remains only about half complete.
The authors compared three early patient experiences at a large American medical school where all preclinical students complete preceptorships and weekly bedside clinical-skills training and about half complete clinical, community-based summer immersion experiences.
About half of the participants completed the letter experiment first; the other half completed the shape experiment first.
About half have completed college degrees, and some have children at home.
Through that process, about 50 countries engaged in research; about half have completed their national reports.
More than a third reported a household income of < $10,000 per year, and only about half had completed high school (Table 1).
Each survey interview took about half an hour to complete.
