When you use the FBW you should have an T/D marker on your ND as well as in your Flightplan. Maybe you didn’t fill out everything. There is a little work to do after importing the Flightplan.
There is a rule of thumb to calculate your TOD.
Altitude/3=NM
E.g., FL300, Altitude where you wanna go, let’s say 3000ft-> 30000-3000=27000/3=90NM TOD Would add a little more, so let’s say 100nm. That’s how the calculator in the EFB works.
You will find your Cruise Altitude in your Flightplan. It depends on your route and weight. Inflight, you can find your max. recorded and optimum Altitude in the MCDU under the Button PROG.