'functioning today' is correct and usable in written English.
You can use it to describe something currently in operation or service. For example: "The fire alarm system is functioning today, so if it goes off, we need to evacuate the building."
"We set out to examine the criminal justice system and how it's functioning today.
He secured federal funding to establish a primary care network in Harlem, still functioning today as the Harlem Renaissance Network.
However, if the Board had copied all or perhaps just some of the practices of their engineers and scientists, the company would still be functioning today.
He shortly afterwards founded Lord Leycester's Hospital, a charity for aged and injured soldiers still functioning today.
The most important metrics from last night's sleep are how refreshed I feel and how well I'm functioning today.
Then there is Mısır Çarşısı, or the Egyptian Bazaar, built in 1660 and still functioning today, merchants selling spices of variegated colors in the coolness of arabesque arcades.
"We understand the global crisis that followed Sept. 11, but our airport had been functioning since 1957".
The vineyard has been functioning since 1978, with winemaker Martin Fowke now boasting the second largest in Britain.
The authorities said the gang had been functioning since 1990 and had illegally cut nearly $400 million worth of timber.
But while it worked briefly, residents say it stopped functioning several months ago.
The lowest differences although significant were seen for the physical functioning (75.76 vs. 79.84) and social functioning (93.63 vs. 99.88).
