If I buy a ticket now, can I use it today?

You can check by clicking on the date you want. If you can click and choose the date, it means the booking is available.

Also, you can check if the Voucher is sent instantly. You can find this below the name of the product.

Instant Voucher: Voucher will be sent within 10 minutes of booking. 

24 Hour Voucher : Voucher will be sent within 24 hours of booking. 

48 Hour Voucher : Voucher will be sent within 48 hours of booking.