after running a simulation you can find cell specific throughput of base station n in
where the first dimension is the number of subframes and the second dimension is the number of SNR points. You could plot this result for a specific SNR over first dimension (time).
Since simulations are performed in a Monte Carlo fashion, a certain number of subframes are simulated and then averaged over in order to estimate the mean system performance. In case of independent channel realizations, plotting results over time will not lead to meaningful results. Only for low user speed and correlated channel realizations, results will show some time variant behavior.