Mine was 55-60 all the time I was running, weight gain during the confinement and stopping running with the club in October saw it rise about 5bpm.
I have been following your journey to fitness which was at the same time as my journey in the opposite direction, you have made some very impressive gains.
I started with one run last week but instead of sticking to the 5km I wanted to start with I took an Italian renter on a longer one to show him the area, it was 12.7km of which I ran 8.5km and walked the rest, stupid on my part, heart and lungs were OK it was my quadriceps and took 5 days for the aches to subside.
If for whatever reason you cannot keep up yor regime you lose the gains very quickly, its happened twice to me through Sepsis and a detached retina, within a month I can lose 25% of my VMA and V02max although RHR remains unchanged, it can take up to 3 months to get back to full fitness but at my age all the measures are declining anyway so I never quite get back what I lose.
I have my second vaccination tomorrow and will start training with the club again, this time its going to be a very slow return to fitness as I have more than 10kg to shift.