As of today, Metricon display homes are still open.
A page on their website, accessible as I write this, dated "as at 23 March", reports:
"All of our display homes remain open for business and we are adhering to social distancing and capacity regulations. We also have increased hygiene measures in place in our displays"
With tonight's announcement from the Prime Minister of yet more restrictions, including on weddings and funerals, it's clear this position from Metricon is untenable, no matter the precautions they've put in place.
Do the right thing Metricon; close your display centres now.