I had RP in February last year. All straightforward.
And my experience on getting back to a regular exercise routine was a source of much frustration. I felt physically fine at 3-4 weeks, was walking some distance, and felt absolutely ready to go running. The surgeon told me, very directly, that it would be deeply unwise. The internal trauma following the op needs time to recover and pressure from running or weights could damage the recovering tissue. 3 months rest, and start running on softer surfaces e.g. treadmills or grass. Avoid paving.
I know others on this forum have started sooner but I did reluctantly wait out the the 3 months. Light running, increasing to regular 3-5 miles in months 4-5. Swimming from month 3., sit ups and weights from months 5-6.
The only noticeable change was occasional dribbling when running on hard surfaces, still get that now from time to time. Otherwise back to normal.
Good luck..