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I usually do for loops to stop every time step if I want to return values while a simulation is still running.

For this instance, I return the bus frequency value for every timestep.

ini_time = 1
end_time = 60

# Freq Channel
psspy.bus_frequency_channel([1,6365],r"""6365_frequency""")
ierr, rval = psspy.chnval(1)

frequency = []

# Define time steps
time_step_psse = psspy.dsrval('DELT',)[1]
time_steps_pre_simul = int(math.ceil((ini_time)/(psspy.dsrval('DELT',)[1])))
time_steps_post_simul = int(math.ceil((end_time - ini_time)/(psspy.dsrval('DELT',)[1])))

for k in range(time_steps_pre_simul - 2):
    # simulation
    psspy.run(0, psspy.dsrval('DELT',)[1]*(k+1), 1,1,0)

    # read and write freq
    freq_val = psspy.chnval(1)[1]
    frequency.append(((freq_val+1)*60))

## Fault simulation
psspy.run(0, ini_time,1,1,0)
psspy.dist_machine_trip(trip_machine,r"""1""")

## Post fault simulation 
for i in range(time_steps_post_inject - 2):
    psspy.run(0, ini_time+psspy.dsrval('DELT',)[1]*(i+1), 1,1,0)
    freq_val = psspy.chnval(1)[1]
    frequency.append(((freq_val+1)*60))

This worked for me.