Bees that swarm in trees and other such exposed objects are only temporary. A colony of honey bees cannot survive outside. They will move on usually after a few hours or the following day. If for any reason they don’t move on, they will die.
However, if you know of a beekeeper in your area, give them a ring and they will collect them and make good use of them.
You should have a local beekeepers association who will have a list of beekeepers willing to collect them for free.
These will then either be added to the beekeeper’s own apiary, or they will go to a beginner who is just starting out.