no i didnt have platinum yet, So I guess if I upgrade I wont be able to get bonus if I will open it in the future?
Correct.
If you hurry up and do it now, you will be able to get the $200 airline credit for this year.
It will reset it January
Keep in mind the $450 AF..
IMO, there will be another 50K offer for the Plat, but by upgrading you will avoid getting a new TL, which IMO is worth it for the upgrade