Hello!
Unfortunately this bit of information is not available in MarketFeeder Pro (we are working towards adding a variable for the maximum traded price at any given moment, but keeping a history of these values would consume too much computer memory).
You can, however, get the maximum offered price of a selection over the set period of time via the variables maxbp_{interval in minutes} (for back prices) and maxlp_{interval in minutes} (for lay prices).