The good news is that Congress drafted its bill Sunday evening and within the 110 pages (up from it's original 3 pages to start), there is an important clause that should be good for mortgage rates.
On Page 40, it says, summarized:
* The U.S. Treasury gets $250 billion up-front
* It must ask the President to approve its next $100 billion
* And Congress must approve the remaining $350 billion
In other words, the U.S. Treasury checkbook is not "open". By limiting the Treasury's spending to $250 billion up-front, with the next $450 billion subject to third-party approval, some of the market's inflation concerns from last week should ease, providing downward pressure on mortgage rates in general.
But, that said, there's a few important data releases this week that could counter-effect these improvements.
First, today, it's September's Personal Consumption Expenditures data. The report sounds fancy with a name like Personal Consumption Expenditures, but it's really just a Cost of Living measurement, adjusted for human behavior.
For example, if whole grain cereal gets too expensive, PCE assumes that Americans will substitute for another breakfast food. This is one reason why PCE is the Fed's preferred measure of inflation.
The PCE did come in higher-than-expected, at 2.0%, which leaves the year-over-year PCE at 2.6%, the highest since 1995. At this point it hasn't made an impact in Mortgage rates because the Rescue Plan remains the focus. But it is considered inflationary and could cause rates to increase once the Rescure Plan is completed.

Rates up or down, it's too hard to predict. Therefore, if you see a mortgage rate with a comfortable accompanying payment, consider locking it in.
With as fast as markets have moved this year, you can be pretty sure the rate -- whatever it is -- won't last for long.