There is little doubt that the above extract implies that the time and temperature values should be available on the 3,5" display by judicious (combination) use of the controls to the left of the steering wheel.
BUT
the (English) manual for my 2024 model doesn't mention them in the options set out in "A" above, and the general 3.5" layout is somewhat different.
Intriguingly, if I download the Swedish or Italian versions of the 2024 manual, they both align with my English version!
Fiat manuals are generally "hit and miss" and can be misleading so if it is the 3.5" display I'd experiment with the LH controls. There is just a chance. however, that the two values are simply not available (though I'd be surprised).
I can't help empirically, as I have the 7" display and the Uconnect 10 radio, and the two values can be configured on both. (If the vehicle has a factory-fit radio, which it may well not do, there's just a chance that the values are available there)