"usually focused on" is grammatically correct and commonly used in written English.
Example: The meeting agenda is usually focused on discussing strategies to improve sales.
Perew's cooking lessons usually focused on one vegetable or fruit grown in the garden.
Most serious shops have either a tasting bar or offer weekly wine tastings, usually focused on one region or grape.
Research dedicated to rare endemic plants is usually focused on one given aspect.
The manager is the one usually focused on.
Such plans have usually focused on computers and software.
But in this town, the public's eye is usually focused on what's newest, brightest, shiniest.
Such open communication is an organizational rarity in an industry that's usually focused on departmental specialization.
Challenge prizes, usually focused on the cutting edge of science and technology, have a long history.
The fraud schemes usually focused on investments in hot sectors like commodities or nanotechnology.
They usually focused on what she looked like, and seldom on her ideas or the issues she raised...
Indian officials are usually focused on keeping a lid on the country's growing population of 1.2 billion.
