Dear valued customer
Thank you for contacting Samsung Levant
kindly note that unfortunetaly as for the 2.5 update there are no specific date when it will be released as once its available you will receive a notification message to update it
as for how many updates your device will receive unfortunately
Samsung guarantees Android OS upgrade three times only for Galaxy flagship products (S series, Note series, Z series) after Galaxy S10 series launched in 2019. Also, it need to consider the hardware specifications and resources appropriate for the upgrade.