There are in the neighborhood of 150k members, 15% (16,500 signatures) were needed by September 23 to force a vote of no confidence. Now that the necessary signatures are finally obtained and validated by the club, the 'true' machinery of the motion, which involves a vote where a minimum of 10% of the member census participates requires 2/3 of votes against the president for it to succeed in the removal of Bartomeu & his board from office with immediate effect
Vote has to be within 20 days and if successful, elections would be called up 40-90 days after
There's absolutely no chance Bartomeu resigns in my opinion, rather tactics on how to prevent sufficient 2/3 to be successful.
There is also the matter of the fiscal imbalance that Bartomeu & board will be personally on the hook for, also with immediate effect, should the vote be successful in their ousting - Unless a deal is brokered