Waiting is pain in the ass game in tech , sure any sucessor will be better in such trend wait and wait and never ending wait.
Ampere will be announed in August ( till now) and will be released in September , to arrive here to to ship from Amazon - October ETA ( ~ 6 months from now) if Nvidia kept on its pre set schedule and did not change due corona outbreak. Lunching DLSS 2.0 is a smart move by Nvidia as a plan B or to shfit gears any time.
5-6 Months for now , considering the economic crises here ( capital control , devaluation of the currency , and gloomy coming days) .. Any upcoming tech will be insanely priced to be in your doorsteps ( as inflation trend is exponential). Therefore 5-6 months from now a 2 Million LBP will bring a 2060 non super.
For QHD 144hz I recommend an RTX 2070 Super ,
On Many 2020 Titles and Upcoming 2021 AAA titles of your want to play very high - Ultra settings with Anti Alaising , since QHD needs AA ( not the shitty FXAA , at lease 2x MSAA . The 1080ti is not sufficient for 144hz at QHD.
Here is a Glimpse
https://youtu.be/usgBMJCwmVo
I used to have an 1080ti Strix heavily OC'd to 2000mhz Core and memory OC'D to 11 Ghz using a PG 279Q , 1080ti started to be lagging in 2020 titles at 144hz.
Your best bet is a 2070 Super , you will have a much more future proof ROI investment.
Support of the Upcoming Dirext X 12 Ultimate , which will boost rasterized perfromance using variable rate and mesh shading
DLSS 2.0 Support using its tensor cores
Better old fashioned rasterized rendering performance
Lower lag using HDR 10 gaming , dedicated hardware for HDR bitmapping that Maxwell relied on software ( more latency)