I work with a lot of cherry. It's one of my favorite woods, and I would never stain it. The lighter sapwood is not considered a defect so there will usually be some on most boards. For something like a frame where the pieces you need are relatively narrow, just rip off the light sapwood and use it for firewood. Cherry with a natural finish like tung oil will darken over time to a beautiful rich color. If you try to stain the sapwood to match, the color won't change and eventually it will be very obviously different.

I started out with nothing & I've still got most of it left
M60 VP160 QS8 EP350
M22 VP100
Algonquins