Diablo IV open beta access on ps5

I Pre-ordered Diablo IV for my son Via HMV’s website and it states this also includes access to the Open Beta taking place on the 17th of march until the 19th, will the game arrive in time or how does he participate? thank you

Did you get a “Beta Early Access code” ?

If so, it looks as if you can redeem it; see the instructions (under EARLY ACCESS BETA CODE REDEMPTION) here: https://news.blizzard.com/en-gb/diablo4/23916442/your-guide-to-the-diablo-iv-open-beta#Redemption