The phrase "already earned it" is correct and usable in written English.
You can use it when referring to something that has been deserved or achieved prior to the current moment.
Example: "After all the hard work and dedication, I feel that I have already earned it."
Alternatives: "have deserved it" or "have rightfully obtained it".
In its contempt for liberal democracy, Khanna's "The Second World" would be refreshing if it were not so wrongheaded and so badly written: "Located at the mouth of the Yangtze River, Shanghai subsumes China's best and brightest into a culture of doing in the way New Yorkers are known for, its first world urban culture and cosmopolitan design already earning it the status of a global hot spot".
Facebook's recent workaround for Adblock Plus and other ad blockers is already earning it money.
The numbers are well down for Ted 2 – currently on $166.6m against the first film's $549.3m – but a $68m budget means it's already earned its keep; it'll be hoping for a boost from the Japan release (28 Aug), where Seth MacFarlane's original was No 2 overseas territory.
The latest candidate for supernova celebrity – provisionally called PTF 11kly – is blazing in the Pinwheel galaxy, 21m light years away: it has already earned its place in history, if only because astronomers caught the explosion within hours of its commencement, and are now fiercely measuring every stage of its bright but brief convulsion.
Chris Tomasson at Fox Sports seconds that: "The way they've battled in these playoffs, the Heat already have earned it.
All Russian cosmonauts are awarded the title of Hero of the Russian Federation following their voyage into space; some may already have earned it, for example for long service as a test pilot.
His sturdy play has already earned him a two-year contract extension through 2014-15.
Given that Cars 2 (after just over a week in domestic release) has already earned over $100 million, it's clear that moviegoers can't get enough of Mater and Lightning McQueen.
