We anticipate the hardfork progress to take a couple weeks as it needs at least 90% of our community to update to the newest version of the software. (Users can find that here: https://bytecoin.org/downloads)
You may also read more details about the hardfork here: https://bytecoin.org/blog/bytecoin-hardfork-adoption-guidelines
if im understand correctly all the exchanges have already done this, that is, if there are problems, it is better to drop it on the purse of the exchange before it is completed? or there is no difference and the tokens will not be lost even without an update?