What is 4G & 5G T304 Timer?

What is T304 Timer? and How does the UE detect a Radio Link Failure based on this timer configuration ❓

• T304 Governs RRC Reconfiguration Procedure for the HO, Simply means that If the UE does not complete the handover before this timer expires, the UE reverts back to the associated configuration and initiates an RRC connection reestablishment procedure.
• The T304 Timer is specified using a value of 50. 100, 150. 200, 500. 1000 or 2000 ms.
• The UE starts this Timer upon receiving the RRC Reconfiguration message for the mobility control information. “MobilityControlinfo”
• If T304 expires before the UE MAC successfully completes the random-access procedure on the target cell.
• The UE initiates the RRC Connection Reestablishment if the timer expired before the UE completed the HO.

How to check related T304 related timer configuration from layer 3 messages ❓

• From: RRC Configuration “MobilityControlInfo” in 5G SA & 4G