After one of Omar's photos was shared almost 300,000 from the Cats of Instagram page, Guinness World Records contacted Ms Hirst. The three-year-old from Melbourne, Australia reportedly clocks in at an impressive 120 centimetres (47 inches) long, weighing a total of 30 pounds.
The current record holder is UK-based Ludo, also a ME coon, which measured in at 118.33cm long in October 2015.
His daily routine consisting of a 5am start, a couple scoops of dried biscuits, lounging around the house, a little exercise outside in the backyard, then an afternoon nap on the trampoline, before a scrumptious dinner of kangaroo meat. An Arabic-named supersized cat in Australia is now being considered for a Guinness World Record.
'He got to that before he was one-year-old and that's when we sort of realised that he's not almost done yet'.
But being Instagram-famous, or even world-famous, doesn't seem to be high on Omar's list of priorities.
The current record holder is a 118cm Maine Coon from Wakefield in West Yorkshire.
"He won't be becoming a diva anytime soon", Hirst said.
Now, Hirst has submitted Omar for consideration of the record and it would typically take Guinness up to 12 weeks to response.
An Australian cat may be the world's longest.
"We buy human-grade kangaroo meat at the supermarket", Hirst was quoted by the BBC as saying.
"Rowan always wanted a big cat", she said. "It's the only meat we could find that he actually wants to eat", Hirst said.
"He sleeps on the couch. because he takes up too much room on the bed and he demands we cuddle and pet him all through the night", Hirst told the newspaper.