Hi anthony
Just completed my second Otter Trail last week. We had fantastic weather except for one day of light rain.
Made it to the Bloukrans in time for low tide at 8:44am, and decided to go for the 'route A' crossing recommended for low tide (the route crosses the river in a straight line nearest the ocean, and emerges in a small sandy cove). All members of the group made it across safely, many of them aged 50+

. At the 'route A' crossing, the water was was about thigh-deep the whole way across, with some small waves in the surf. Slight backwash, but the water was very shallow and this was manageable. I carried my backpack in my arms the whole way across, all walking, no swimming.
I'm sure you'll manage fine