"now extant" is correct and usable in written English.
You can use it to refer to something that exists or is available at the present time. For example, "The plays of Shakespeare that are now extant have been studied for centuries."
Egyptian Jews also composed poems and plays, now extant only in fragments, to glorify their history.
More than 200 separate works have been attributed to Ibn Bābawayh, although only a few are now extant.
The earliest now extant are those of the English king Richard I in a charter of 1189 for the government of those going to the Holy Land.
Hastings was a man of the enlightenment, who insisted - in contrast to later British rulers of India - that his men learn their de facto subjects' languages and revered "the Braminical writings, the most ancient perhaps of any now extant".
The three main vowel systems now extant are the Babylonian, the Palestinian, and the Tiberiadic; of these the latter is the most important and, indeed, the only one still in use.
I suspect therefore from internal Ev[idence] the above to be the correct List, and not the one on the opposite page". The "Kent list" thus becomes the only evidence of authorship in Hamilton's hand which is now extant.
Other probable Kannada writers, whose works are not extant now but titles of which are known from independent references are Syamakundacharya (650), who is said to have authored the Prabhrita, and Srivaradhadeva (also called Tumubuluracharya, 650 or earlier), the possible author of the Chudamani ("Crest Jewel"), a lengthy commentary on logic.
Multiple subspecies of wolves were described for the Pacific Northwest; C. l. ligoni in Southeast Alaska, C. l. fuscus of coastal BC, Washington and Oregon (now only extant in coastal BC), and C. l. crassodon on Vancouver Island [17], [18].
The now-oldest extant Carnegie library building in Nebraska, it operated as a library until 1991, when a larger facility opened.
Kōfuku and Hokkedō were both constructed in the Gekyō ("Outer Capital") area to the east of the imperial palace (this "outer" area is now where most extant Nara period sites are located), and their assorted extant iconography bears witness to the revolution in sculptural rendering that is a distinguishing feature of 8th-century Japanese art.
His heart, removed and preserved, is also still extant, now held by the Bibliothèque Nationale.
