We don't know how much improving Jones has done with his arm strength, and it's obviously too soon to really see how he's improved but, looking at the end of last year, predicting slight ups or downs of current QBs, and then slotting the current starters according to the almost non-existent additional information we have for this new season, so far, I'd say that Jones starts fitting in to the league hierarchy somewhere after the following QBs (listed in no particular order):
Brady
Mahomes
Rodgers
Wilson
Allen
Burrow
Watson
Jackson
Herbert
Carr
Prescott
Stafford
Murray
Some arguments could certainly be made for others, based off of last year's numbers (i.e. JAG), or based off of multiple recent years if last year was a down year (i.e. Ryan), but starting to think about where he slots after about 13 seems like a fair way to start. Some I've got in the list above may fade (or may not play, again, right Watson?). Some of the younger ones that I didn't list may have big jumps (Lawrence could, for example). But tossing Jones into a group of vets/young'uns after the above, and above the likes of the stiffs currently battling it out for the Seahawks, Steelers, and Panthers starting jobs, or the likes of a Jared Goff or Marcus Mariota or Daniel Jones or Ryan Tannehill when he's without Derek Henry, seems like a fair slotting.
Note: Kirk Cousins is a pain in the ass to rank. Statistically, he's a top 10 kind of QB, but it doesn't translate to winning many big games, and at least some of that is on him.