To identify the last active step you could track the active steps in general. So you can evaluate after the simulation, which one was the last active step. To do so:
1) get the active step output through the Test Sequence block's property/option "Create data to monitor the active step"
(This option is also mentioned on this documentation page: https://www.mathworks.com/help/releases/R2020a/sltest/ug/connecting-blocks-for-verify-statements.html)
2) log this output signal of the Test Sequence Block, like:
3) analyze which was the last step (in the command window):
as = get(out.logsout,('Active_Step'))
as.Values
as.Values.Data
%or
%as.Values.Data(end)
