How long before you can sleep on a memory foam mattress?

Just got a 10” memory foam mattress via FedEx today. It came rolled in a big, thick tube and immediately started to take its shape as soon as i took the packaging off.

My friend has a similar type and says I need need to wait 48–72 hours before I can lay on it. Is this true? I’d love to sleep on it tomorrow night but don’t want to screw up the shape of my new investment. It seems to be fully “settled” btw. I know good things come to those who are patient but that’s never been my strong suit!