According to Mat Piscatella of the NPD group:

https://gonintendo.com/stories/372438-u-s-gaming-hardware-spend-hits-a-new-record-switch-sells-more-q

Here is what I have for all consoles that sold >6M in a year for NPD (since 2001).  NSW 2020 hasn't done it yet, but it will hit 8.7M if it matches last year's numbers, so fair bet that we cross 6M lol.  Note that March/June 2020 are just estimates.

Quarterly sums are provided at the bottom as well as 9-mo total (to compare to 2020 NSW).  All figures are rounded 1,000s.

1516K that missing 100k vs ds 2009 is due to price per product i assume?

Bigger factor is stock.  Look at Mar-Jun and Aug/Sep and look at July.  They burned through stock by early/mid June and had really low inventory in July.  W/proper stock levels, both Jul/August would have been 450-500K and Sep would be around where it landed.

They bumped production (reportedly to 30M global annualized, but I would guess they're above that level), sometime early in the summer and it was reported that stock flowed to JP first then US/Europe in August, so holiday quarter should be a little smoother.  But we're still seeing weekly shortages in JP (most likely building reserve for late Nov/Dec/NY), so I guess they're still not where they need to be yet for all markets.

The difference in price is definitely noteworthy; how much did a DS cost in 2009, $150?

Almost 5M already without the entire holiday quarter... freck!

Yes.  Very good shot at 10M tying Wii/DS from 2008.

I think US peak for the Switch will easily be 2021.  There were many months this year with stock problems, whereas next year Nintendo will know beforehand that it could be a >10M year and production will already be lined up to match.  That plus software slate for next year looks to be killer (Mario 3DW, MHR, Zelda 35th Anniversary, Metroid 35th Anniversary, Pokemon 25th Anniversary, possibly BOTW2, Pokemon Snap, possibly Gen 4 Remakes, killer Indie titles), and not to mention maybe Pro model to boost sales.  

I expect it to challenge DS 09 and go for 11-12M units sold.

It's almost scary how insane Switch's momentum is this year.In 2017-2019 it was pacing like a normal highly successful platform, but now it's hitting the kind of heights only the DS has ever managed before, which is just insane.