Phone cameras will be tough because of the tiny aperture. If you can select longer exposures and you can prop the phone up on something you might be able to see it. Take several exposures and add them together.
Clear here at sunset, but immediately turned crappy. Had the telescope set up on the back deck. Never saw the comet through the clouds by-eye, binocs or the spotting scope, but took a 105mm piggyback sequence
with the scope tracking. Just a rough polar alignment and no guiding, 10s exps to start, then stepped up to 30s. Menacing trees rising up to cover the comet, but complete overcast at the end.
Tonight looks promising, but the back deck won't work. Found a spot in the upper yard that will work with some minor tree trimming. Its either that or drive to the church, but lots of streetlights there.
My Canon clock drifts badly too. No GPS, so I set it manually each time if I remember. Your setup is pretty ideal for catching satellites. Those fast, large aperture wide-field lenses are perfect. Even your 300mm (no tele) would work for the tight starlink groups, but you'd have to point carefully. My telescope works great for catching them, but the FOV is only 1/2 degree. Your 35mm fixed should work well. You could almost shoot video, or a series of very short exps - 1/4s maybe. I've taken a few sets that short, but my camera can only go 4 frames before stopping to dump the buffer.
The Crew Dragon is scheduled for undocking and re-entry on Aug 2. If the timing works out you might be able to get some formation flying shots
with the ISS. Saw a great overhead ISS pass last night while setting up for the comet. Low passes tonight, but a decent one tomorrow. Good pass for VT tonight
right above the comet at 10:05 PM EDT.