I was approved for refund on June 4 how long will this take

How long it takes depends on your payment method and billing cycle. Typically, store credit appears within two days, credit cards can take up to 30 days, while cellular billing up to 60 days. These days I would assume everything might take longer than usual.

For more details see this Apple article:

https://support.apple.com/en-us/HT210904