Simulink positive-sequence power calculation block

Is it true that the "positive-sequence power" block always have a delay of 1 cycle when calculating P and Q?

Is it appropriate to use this block to estimate P Q step response (because the 1-cycle delay will affect the true step responses of P and Q)?

If "positive sequence PQ" calculation block is inappropriate in estimating power step response then what is a viable alternative? Is it the "instantaneous PQ" block?

I know it's probably too many questions to ask in one post, but I really need to clarify this thing. Thanks.