Foundation Crack and Severity

My wife and I recently completed a house inspection. A little on the house: it was built in the late ‘40s, the grade is excellent and has been built up around the entire house, the drain spouts do not extend far enough away from the house currently. There was seepage in the basement a number of years ago but has been dry for the past decade or so and was said to be caused by no drain extensions. Weeping tile was put in and drains to the sump (which was also put in), and there are two cracks in the foundation we could see. One was located under the stairs, although it was a hairline fracture, and the other larger one as shown in the picture was located under the deck.

The larger one looks large. Now what may downgrade the severity is the age of the house, understanding some shifting will occur over time. The other is that it is located on a footing that may be separate from the house and basement foundation, and kind of like an addition for the stairwell that doesn’t extend into the basement. It also looks as if it may have been filled but unsure as of when.

My questions are:

Is this a serious cause for concern?

How much more shifting and cracking can we anticipate?

If we fix the drainage issues and ensure we trigger the sump to make sure all water is drained, can we prevent further cracking?

If this is something you think should be fixed, what method of repair would be used, and what approximate cost would we be looking at to complete this work?

This is potentially the first house we are going to buy, so all critical eyes, professional and otherwise, are welcomed and appreciated. (We live in the prairies, Canada for reference).