Hi Elsie,
It's really too early to say one way or another at the minute. Bookings for this tour are going well given that it is still a number of months which is positive and hopefully this will continue. If you give me a nudge every few months, I will happily give you an update of the booking numbers and status of the holiday.
Given the nature of the holiday, the tour has a number of dates around your preferred departure, so in a worst case scenario (which I hope doesn't happen for you) if the tour were not to operate, you may be able to join one of these other dates.
Kindest regards,
Julia