congratz, that's a great rig you got there
the 2080ti ofcourse is a fantastic card that will give you a good performance boost, but personally I think I would wait the 6-9 months for the RTX 3000 series, as that one marks Nvidias move to the 7nm node and hence is anticipated to be another great jump
obviously that's up to you and in the PC space there always is some better hardware just around the corner