When you are bringing a bottle of wine as a gift, you should keep certain things in mind.
If your host and or hostess is serving food, they may have already picked out the wine they wish to serve based on their own personal tastes and criteria. Depending on what it is they have already selected, chilling or decanting may have already been in the process to be ready for the appropriate time.
The wine is as you stipulated a gift and being a gift it is up to the receiver to have the option to save the gifted wine for a later opening of their choosing or to serve it. Proper etiquette would dictate that you should not necessarily expect that the bottle should be opened for your pleasure and you should not suggest that the bottle should be opened. If you are asked, you might respond with something along the line of “the wine was brought for you to enjoy, however and whenever you wish”.
If you asked your host/hostess beforehand about what you could bring for the occasion and they suggested a bottle of wine, you should then inquire as to what is being served so you may pair it appropriately. Under those circumstances, it is reasonably certain that you will see your wine served since it is both a gift as well as a contribution to the food being served.