I think it's definitely important to keep the calendar in perspective. Roughly half of the Top 50 free agents heading into the winter are still on the board, and a lot of guys who would fill the role of e.g. backup 3rd baseman wouldn't even make such a list. If you compare this offseason to last, Shota Imanaga was signed last Thursday, then the Michael Busch trade was Saturday. Hector Neris is two weeks from today, and Cody Bellinger is more than a week out.
That said, I wouldn't expect a ton of impact from this point onward. Some of that is for bad reason: Tom Ricketts is cheap. Some of that is for good reason: Iowa is pretty legitimately loaded, and you do want to allow some opportunity for those kids to percolate up through the year. But I would say there's a possibility the team adds an impact SP from here, but anything else will clearly be complimentary pieces. A solid closer (probably one of the old guys) and two bench bats.
Where that nets out is likely a team that projects to win the division by 2-3 games without that impact SP or 4-5 games if they do add him. Paired with the talent at Iowa I think that's a legitimately good spot to be in, but it also yet again feels like a missed opportunity to pull further away from the rest of the division. We've all seen the Brewers make quick work of a 3 game projected advantage before.