You may either:

1) wait the time you want (within th 5-minute timeframe) and save both high and low values in two separate variables; of course the day you launch your strategy it’ll wait the next 11:35:00 candle which might be the nest day.

2) being in a 5-minute timeframe you may access the required bar using brackets after high/low and computing the index based on the fact that an hour has 12 bars; you have to retrieve current time an then compute how many bars have elapsed since 11:35:00 and use that numer as an index (i.e. HIGH[32] and LOW[32] to access the values of the 32nd bar previous the current one). This calculation is not as straithforeward, but it allows not to have to wait the next day to retrieve desired data.

Here is an example for option 1:

ONCE HighestPrice = 0
ONCE LowestPrice  = 0
   .
   .                     //Place here any further variable or piece of code
   .
IF time = 113500 THEN    //These values will be updated each day at
   HighestPrice = high   //11:35:00
   LowestPrice  = low
ENDIF
   .
   .                     //Place here any further piece of code or condition or Buy/Sell order
   .

Hope it’s what you you were looking for.