I don't believe the Falcon Heavy center stage or second stage are reusable in that configuration. The second stage isn't reusable in any configuration.
As of right now, Nov 14th 2024, no Blue Origin rocket has ever been declared even throw away "usable" for an orbital mission. In 25 years of existence the Space Company BO has placed exactly 0 Kg's into orbit. An epic failure by any measure. Especially considering how well funded they have been.
I hate being this critical but, this is just a "cold shower" fact.
I wish them luck BUT luck does't actually put anything into orbit. Everything for NG, is brand new. I don't even think they have tested trying to fuel the whole stack. Have they test fired the 1st stage, yet? The launch team, is also green any issues will be their 1st attempt at any kind of real trouble shooting a real problem. Most of their troubleshooting tools have never been used. H2 is always been a pesky fuel to tame.
While I am glad they are pushing forward, rushing at this point also might seem kind of foolish. I am getting the feeling they are suffering from "Go Fever". I get the feeling they are still about 9-12 months away from the 1st test flight. I would think a few 2-3 hot test firings of the 1st stage would be in order. Another test firing of the 2nd stage would make sense. With extensive inspections after each test fire. Making sure nothing rattles apart is much easier to do on the ground.