How should I install 5" white oak hardwood?
If it's solid hardwood and not a laminate or engineered, you probably don't want to glue it. How thick is it? Generally hardwoods are edge nailed through the tongue with a special nail gun. 

3 days isn't a great amount of time for it to acclimate, but if you take it out of the boxes and spread it out, that'll help. 

You may want to contact the manufacturer if you bought it boxed some place or contact the mill where you bought it and see what they specifically recommend.