I’ve bypassed many timers. BEar in mind you get anything wired wrong you’ll be tripping the elctrics so take notes/photograohs before starting and make sure the power is off.
Usually theres a neutral coming in that can be ignored or capped off, then theres a live into the timer and a live out to the switch/thermostat. The live in just needs to go straight to the switch/thermostat.
Again, make sure power is off and notes taken because if anything goes wrong you can then revert back.