The correction is applied every 150 msec.
Does that mean you take a new "reading" every 150 ms ?
1> Should I wait 50 msec + 68 msec to get fitered data from INA219 ? ( without looking at the end of conversion bit ).
in free run mode yes ,the "read" you get is the latest available
2> what is the operation of the end of conversion bit ? Is it relevant to What start of conversion ?

in free run i don't see it has any useful function


How is the "start of conversion" started ?
set the config to the triggered mode you desire


what is the triggered mode ? I can not find any description on the ds.


data sheet
BASIC ADC FUNCTIONS
 Writing any of the triggered convert modes into the
Configuration Register (even if the desired mode is
already programmed into the register) triggers a
single-shot conversion. Table 7 lists the triggered
convert mode settings