Craig Edwards has a piece on FanGraphs covering projected 2020 team payrolls. I'm stealing a graph from there:
The Giants have the 11th-highest payroll. In 2019 it was 9th, in 2018 it was 3rd, and in 2017 it was the 4th-highest. The last time the Giants were below the top ten was in 2010 when they had the 11th-highest payroll. Check out the history here.
As far as off-season spending goes, the Giants (approximate) outlay of $30M ranks tenth. It doesn't seem like they've spent that much, but if you break it down (Cozart $13M, Gausman $9M, Flores $3M, Pence $3M, etc.