private var timePickerDialog: TimePickerDialog? = null

...

private val setTimeListener = TimePickerDialog.OnTimeSetListener { _, hourOfDay, minuteOfHour ->
    hour = hourOfDay
    minute = minuteOfHour
}

...

val calendar = Calendar.getInstance()
val currentHour = calendar.get(Calendar.HOUR_OF_DAY)
val currentMinute = calendar.get(Calendar.MINUTE)

timePickerDialog = TimePickerDialog(context, setTimeListener, currentHour, currentMinute, true)
timePickerDialog?.show()