Yup! I got a temporary number on my Hilton Aspire right after applying and used it to make the spend all in one shot. The points posted pretty quickly too.
@hsmamato2 - First, you need to click on the saver economy box and see if the flight is actually a saver award. If is is grey then it is not.
BA is distance based. So the number of Avios you need will depend on the distance flown. It will cost me more Avios on an AA operated flight books with BA Avios to fly from Florida to Hawaii than it would for someone from LA to Hawaii even though both say 22,000 AA miles. Hope that helps.