lifter issue?

It´s been two days since I ran the engine.
Should I be able to press the hydralic lifters after these two days?
Was trying to depress them with the pushrod but they are rock solid.
I´m going to buy the tool that´s used to remove the lifters, to have a look at them.

Is there any way to measure the cam lobes while the cam is in the engine?

Grateful for any help.