It's already been 60 day and the free credits should be expired. But the expiry date shows till 01/01/2023. Can I still use it?

The expiration date shown in Cloud Manager is the final date that the promotional credit will be applied to your invoice. So if the date for your account is "01/01/2023", this means the credit will be applied to your January invoice. After that date, the credit will expire.

Thanks for the help.