CANCEL DURING READ-ONLY TEST of RESIZE

I'm using GParted Live on a CD (Latest version from official site) and am working on a 1TB external hard drive.

Before the operation, it was a 200GB partition (Empty) on the left and 731GB partition (Almost full, ~40-45GB free) on the right.

In the 1st of the 2 operations, GParted deleted the 200GB partition first without issue.

In the 2nd operation, GParted:
- Calibrated the partition successfully.
- Checked the file system successfully.
- Grew the partition from 731.51 GiB to 931.51 GiB successfully.

It is currently moving the file system to the left.

According to the details, it is using a block size of 8.00 MiB to read-only test at the moment. I was stupid and used USB instead of eSATA and it says it is going to take 7 hours and 40 minutes to "Move /dev/sdh2 to the left and grow it from 731.51 GiB to 931.51 GiB. The status bar currently shows 95+ GiB of 731.45 GiB read and moving consistently, but slowly.

Are there any other steps OTHER THAN the Read-Only Test that it shows in the queue?

It looks like this in the Details tree for operation 2.

> Move /dev/sdh2 to the left and grow it from 731.51 GiB to 931.51 GiB
    > calibrate /dev/sdh2
        path: /dev/sdh2
        start: 419432448
        end: 1953519615
        size: 1534087168 (731.51 GiB)
    > check file system on /dev/sdh2 for errors and (if possible) fix them
        > ntfsresize -P -i -f -v /dev/sdh2
            (let me know if you need the log from this)
    > grow partition from 731.51 GiB to 931.51 GiB
        old start: 419432448
        old end: 1953519615
        old size: 1534087168 (731.51 GiB)
       
        new start: 2048
        new end: 1953519615
        new size: 1953517568 (931.51 GiB)
    > move file system to the left
        > perform read-only test
            using internal algorithm
            read 731.51 GiB
            > finding optimal block size
                optimal block size is 8.00 MiB
            > read 731.45 GiB using a block size of 8.00 MiB

Nothing else below that.

Is it safe to cancel at this point or is it still going to read/write the data? I really need to use the computer it's using so this is frustrating?

(No, I do not have a back-up either and the data is important. However, I'm not an amateur with computers and have a lot of experience with Windows. Just not linux, linux commands, etc.)

*UPDATE* ALSO, it would be a MAJOR problem if it still has more than 8 hours of tasks left. I would live if it's too risky but it'd just be a MAJOR headache.*