The phrase "already viable" is correct and usable in written English.
You can use it to describe something that is currently functional or feasible, often in the context of projects, ideas, or plans that have reached a stage of practicality.
Example: "After several rounds of testing, we can confirm that the new software is already viable for deployment."
Alternatives: "currently feasible" or "already functional".
They're already viable for many players.
In their youth, Bassy and Steph were already viable celebrities — talkative, full of smiles.
In the last year, Hearst Magazines christened Lifetime, but the magazine really just puts an already viable broadcast brand into print.
There are commercial markets that are already viable and prices always come down once a technology is implemented on a larger scale.
The paper shows that while the use of biomass is already viable under CO2 prices that have been reached within the EU-ETS, investments in new biomass plants need a higher price level as well as more stable prices, conditions which cannot be predicted with any confidence.
We note that the total number of possible novel phenotypes decreases exponentially with the number S of sulfur sources on which a network is already viable.
Leti Arts is already a viable business but Tawia says he hopes it will be much more than that.
This immersive approach to recording performance has already proven viable with pop acts (Miley Cyrus, Justin Bieber) and opera (the recently released Carmen 3D), but Wenders takes the use of stereo photography further to convey artists' movement through space.
There is already a viable renewable energy industry you can support by buying electricity from a green supplier; soon, you'll be able to buy budget domestic environmental systems that can intelligently manage your energy consumption.
Even if we gave up on all the obscure and unconventional fossil fuel resources that companies are spending billions trying to access and just burned the "proven" oil, coal and gas reserves – the ones that are already economically viable – we would emit almost 3tn tonnes of carbon dioxide.
