They are instant and you don't need to wait for physical delivery or pickup of the vouchers.
These are listed as "E-RAA Screen Savers", and you need to purchase a minimum of 4 vouchers at a time.
The coupons are valid for 6 months and are not valid Saturday nights.
They list a separate item "E-RAA Star Adult Vouchers" which are $13.50 and are valid for 12 months, and can be used any time including Saturday nights.
Other current ways of buying event cinemas tickets for those interstate:
RAC (Western Australia): http://www.ozbargain.com.au/node/89144
Telstra : http://www.ozbargain.com.au/node/94851
Oscar movies: http://www.ozbargain.com.au/node/94372
Would these work interstate, say, if I had a relative in SA who could buy these for me?