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We propose to conduct deep X-ray observations of 12 nearby tidal disruption events (TDEs). This sample selected from the first three years of the Zwicky Transient Facility operation has good temporal coverage of early-time X-ray data. The proposed observations will be the first experiment to systematically study the X-ray emission of optically bright TDEs at the time when the accretion is expected to transition from super-Eddington to sub-Eddington. This program will help us to (1) investigate the timescale of delayed X-ray brightening (2) explore the existence of disk corona and the efficiency of Comptonization (3) measure the mass accretion rate which directly tracks the mass fall-back rate at late time. [truncated! Please see actual data for full text]