No the M490DE cannot be reset during the delayed egress time using the standard basic wiring arrangement of separate switch contacts on the RLS (Release) and the RST (Reset), it will not reset during the delayed egress period.
However, if the M490DE is wired with the option to use only one switch contact for both RLS (Release) and the RST (Reset), then yes it will allow reset during the delayed egress period.
From the installation guide section 6C:
(Optional) To use one access control for both Reset and Release:
Dry contact closure from any access control system
- Will release lock in locked condition
- or reset lock in alarm condition
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