Hi!
At my airline, the PF, when hand flying, calls for everything and the PM does it.
Once the Autopilot is back on, then the PF is responsible for all the button pushing (but they can always ask the PM to do it for them if the PF wants it that way).
cliff
KMIA
Note: The most important point, at my airline, is getting the button pushed at the correct time, and it does not really matter who does it. The crew needs to work together to run the trip safely and efficiently.