CG position on cruise calculation.
The easiest way to know your CG position at any time, is to correct the LIZFW that shows your Load &Trim sheet by the fuel index corresponding to the fuel currently onboard. Treat this index as a virtual new LITOW and enter into the CG envelope, considering your current weight, to find out the new CG in terms of MAC.
This method works as far as you have manual load sheets onboard, an these are made according IATA standards AHM 516,519. Does not matter aircraft type.
REGARDS