How much muscle gain through first cycle?

[dasein]

I am currently 187 lbs, 6'2, 17 y.o and I just started working out 3 weeks ago so there are still a lot of newbie gains.
In about 2 months I will start with 280 test and 4ius of growth (maybe i will throw in some primo). My current physique is below. How many gains can i expect in like half a year?

 

[Noahlooksmaxx]

bro did not workout for 3 weeks

 

[anondude]

Mostly genetics but good diet and program 10-20 lbs extra

 

[dasein]

bro did not workout for 3 weeks

yes i did, i was always fairly muscular for not working out ig

 

[dasein]

I am currently 187 lbs, 6'2, 17 y.o and I just started working out 3 weeks ago so there are still a lot of newbie gains.
In about 2 months I will start with 280 test and 4ius of growth (maybe i will throw in some primo). My current physique is below. How many gains can i expect in like half a year?

View attachment 4935436

@Traeger