The phrase "already in control of" is correct and usable in written English.
It can be used to indicate that someone or something has established authority or dominance over a situation or entity prior to the current moment.
Example: "The manager is already in control of the project, ensuring that all deadlines are met."
Alternatives: "currently managing" or "already overseeing".
Already in control of Congress, the Democrats seem poised to take the White House.
The Republicans, already in control of the House, are four seats away from taking control of the Senate.
"There can be no 'mopping up,' because that term implies that we are already in control of the situation," he said.
The army is already in control of seven of eight West Bank cities, which it seized six weeks ago after back-to-back suicide bombings in Jerusalem.
Both times, Cairo's presidential palace was left untouched because in both cases the army was already in control of it by the time the presidents were formally ousted.
The group was already in control of areas around the airfield, including the nearby city of Mukalla, which is the capital of Yemen's Hadhramaut Province.
Nav Canada, the privatized Canadian air traffic control authority, already specializes in control of airplanes where there is no radar, notably in the North Atlantic.
The Democrats, already firmly in control of the House of Representatives, scored modest gains yesterday, spokesmen for both the Democratic and Republican Congressional campaigns said early this morning.
It was Emirates Team New Zealand, already well in control of the race against the Prada-backed Luna Rossa, that, hit by a gust of wind, buried both bows of the 72-foot wing-powered catamaran into the choppy waves as it went round the third turning mark.
In 1920 Britain, which had already been in control of the area, established a mandate over Palestine under the auspices of the League of Nations.
The battles are taking place in the capital Damascus, and the reports, while some may be somewhat exaggerated, are very clear: the rebels of the Free Syria Army are fighting in the very center of the city, are about to be, or already are in control of some of the headquarters of the once feared intelligence organizations, and it is all taking place minutes away from the presidential palace.
