As for Australia, the Royal Australian Mint says $1 coins bearing King Charles' likeness will enter circulation before Christmas.
New 5c, 10c, 20c, 50c, and $2 coins are expected sometime in 2024, depending on demand from banks as they run out of the Queen Elizabeth adorned coinage.
WATCH NOW: King Charles's state banquet speech. Article continues after video.
However, the Australian $5 banknote may not feature King Charles for a little while. A Reserve Bank of Australia (RBA) spokesperson told The Guardian, “We will plan for an update to the $5 banknote design in due course. Creating the design for new banknotes is a complex process.”
“It can be several years [between] when a banknote is printed and when it is issued into circulation depending on demand from the public and the need to replace banknotes that have become worn in circulation.”
It is expected that the new $5 note will also feature Parliament House on one side and an accompanying design that honours the culture of Indigenous Australians.
Charles is the second monarch to adorn Australian decimal currency after his mother.
Of course, all existing Australian currency (coins and the $5 banknote) that bear Queen Elizabeth’s likeness will remain in circulation and can still be used.
“All Australian banknotes issued from 1913 retain their legal tender status,” the RBA spokesperson said.
"As Australia's circulating coin manufacturer, we appreciate the importance of the transition, and we are applying our considerable skill and expertise producing Australia's coins bearing the new royal effigy," Assistant Minister for Employment, Competition, Charities and Treasury, Andrew Leigh added.
"The staff at the Mint have been very deliberate and measured in the steps to date, and we are now well positioned to expand into production. The coins will circulate by the millions across Australia for many years."