The phrase "already standard practice" is correct and usable in written English.
You can use it to indicate that a certain method or procedure is commonly accepted and routinely followed in a particular context.
Example: "In our industry, using data analytics to drive decision-making is already standard practice."
Alternatives: "common practice" or "established procedure".
In Japan, this is already standard practice in emergency rooms.
While the order to keep magazines loaded in weapons was already standard practice in a few places, the countrywide edict has dramatically underscored how seriously the threats from Afghan forces are now viewed.
This is already standard practice in Europe.
This is already standard practice in union organizing campaigns.
When new cancer drugs are in clinical trials, it's already standard practice to see whether the patients who respond have any telltale genetic markers.
The latter is already standard practice for organic producers in Switzerland, as heating is only permitted to avoid harvest losses from freezing temperatures according to the standards of Bio Suisse.
DOD officials contend that because neither the EPA nor any states have ever attempted to use these laws to regulate military training on operational ranges, the exemptions merely codify what are already standard practices.
Among their duties will be ensuring male and female guests do not mix in the same rooms – already a standard practice in most Afghan weddings – and that the bride is modestly attired.
When it first opened for business here in London, for example, people hiring out desks in other people's offices, or working out of dedicated co-working spaces, was already a standard practice.
But more than half of that money can be used in ways that will not stop foreclosures, including some activities that are already standard bank practices.
Vogt said that the automotive industry already has standard practices for testing that it uses on adaptive cruise control systems.
