In Australia it is becoming very common for non-indigenous people to recite or display an Acknowledgement of Country when making a speech or putting something in public. It usually runs something like this:
"We acknowledge the traditional owners and custodians of (eg.) Ngunnawal country on which we stand, and acknowledge their continuing connection to land, water and community. We pay our respects to the people, the cultures and the elders past, present and emerging."
Of course, you would replace the name of the country with the indigenous name for the region. I happen to be located in Ngunnawal country so I used that as my example. It takes about fifteen seconds and serves to show respect to the people who were here long before British colonisation.
Graham2001 is noting that an Acknowledgement has started to appear on supermarket till receipts. Which is low-hanging fruit, really.