When it expires, it simply prevents you from obtaining additional upgrades until the license is renewed. None of the existing features will go away or be unavailable.
However, whenever you go to renew your license later – it’ll renew from the day it expired, not from the day you purchase the renewal.
If that’s a problem, and you don’t require any Pro features between now and when you intend on setting up your hosting, you may want to talk to Joe/Jamie in the support tracker to work out how best to handle all that