For me it's a QB that shows he's worthy of a 2nd contract and is ranked within the top 12 QBs in the league.
I think it's fair to expect a QB of Fields' talent and athleticism to be just outside of 12th this season. Like 13 - 15.
Ppl can question the receiver talent all they want, great QBs elevate their team. Effing Brady made Wes Welker, Danny Amendola, and Julian Edleman stars. ?
Being able to point to one example and the GOAT no less is not real evidence. Brady has never won a SB without a top 10 D. So while his WRs may have been underwhelming, his team was not. The dude played like shit that first SB but the D kept him in it until he could win it on that final drive.
Right now Fields is surrounded by question marks on D, at WR, and on the OL. Again let's stop comparing him to QBs who never had as many question marks surrounding them.
He needs to improve for sure but his situation is not the same as Brady or Wilson who had elite defenses and had to do very little offensively or a Peyton Manning or Joe Burrow who had elite WRs supporting him.
What we should be looking for are improvements in decision making, reading defenses, throwing on time and with anticipation but that is not necessarily going to translate into big numbers until such time he has a level of support that turns those improvememts into big numbers.