Modern HDDs easily go beyond 110MB/s, but nonetheless stay well below 200MB/s afaik. It'll probably be somewhere in between. Otherwise your figures are fairly correct, if not on the conservative side for NVMe drives (a Samsung 970 Pro will sustain sequential speeds above 3GB/s read and 2GB/s write).

But focusing on sequential read speed misses the main improvement that SSDs give you over HDDs: random reads and writes ("seek speed"). Reading or writing lots of small files from an HDD will ruin your transfer speeds unless they're written sequentially, whereas a SATA SSD will do quite well and an NVMe SSD will do really well. This is the cause of the noticeable speedup when you upgrade to an SSD.