PS5 and PlayStation Store top up cards

[Fresh01]

We have preordered a PS5 for my son for Xmas but he wants to ask a couple of relatives to get the PlayStation Store top up cards so he can download some games. I am just trying to make sure I tell them the correct thing as I have no idea and nor do they.
Are the blue PlayStation top up cards able to be used on the PS5 as well? Reading the details online they don’t mention PS5 but not sure if that is just because it hasn’t been released yet.